diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 22d73fd..e69de29 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1,1837 +0,0 @@
-<?php
-
-/**
- * @file
- * The theme system, which controls the output of Drupal.
- *
- * The theme system allows for nearly all output of the Drupal system to be
- * customized by user themes.
- */
-
-use Drupal\Component\Serialization\Json;
-use Drupal\Component\Utility\Crypt;
-use Drupal\Component\Utility\Html;
-use Drupal\Component\Utility\SafeMarkup;
-use Drupal\Component\Render\MarkupInterface;
-use Drupal\Component\Utility\Unicode;
-use Drupal\Core\Config\Config;
-use Drupal\Core\Config\StorageException;
-use Drupal\Core\Render\RenderableInterface;
-use Drupal\Core\Template\Attribute;
-use Drupal\Core\Theme\ThemeSettings;
-use Drupal\Component\Utility\NestedArray;
-use Drupal\Core\Render\Element;
-use Drupal\Core\Render\Markup;
-
-/**
- * @defgroup content_flags Content markers
- * @{
- * Markers used by mark.html.twig and node_mark() to designate content.
- *
- * @see mark.html.twig
- * @see node_mark()
- */
-
-/**
- * Mark content as read.
- */
-const MARK_READ = 0;
-
-/**
- * Mark content as being new.
- */
-const MARK_NEW = 1;
-
-/**
- * Mark content as being updated.
- */
-const MARK_UPDATED = 2;
-
-/**
- * A responsive table class; hide table cell on narrow devices.
- *
- * Indicates that a column has medium priority and thus can be hidden on narrow
- * width devices and shown on medium+ width devices (i.e. tablets and desktops).
- */
-const RESPONSIVE_PRIORITY_MEDIUM = 'priority-medium';
-
-/**
- * A responsive table class; only show table cell on wide devices.
- *
- * Indicates that a column has low priority and thus can be hidden on narrow
- * and medium viewports and shown on wide devices (i.e. desktops).
- */
-const RESPONSIVE_PRIORITY_LOW = 'priority-low';
-
-/**
- * @} End of "defgroup content_flags".
- */
-
-/**
- * Gets the theme registry.
- *
- * @param bool $complete
- *   Optional boolean to indicate whether to return the complete theme registry
- *   array or an instance of the Drupal\Core\Utility\ThemeRegistry class.
- *   If TRUE, the complete theme registry array will be returned. This is useful
- *   if you want to foreach over the whole registry, use array_* functions or
- *   inspect it in a debugger. If FALSE, an instance of the
- *   Drupal\Core\Utility\ThemeRegistry class will be returned, this provides an
- *   ArrayObject which allows it to be accessed with array syntax and isset(),
- *   and should be more lightweight than the full registry. Defaults to TRUE.
- *
- * @return
- *   The complete theme registry array, or an instance of the
- *   Drupal\Core\Utility\ThemeRegistry class.
- */
-function theme_get_registry($complete = TRUE) {
-  $theme_registry = \Drupal::service('theme.registry');
-  if ($complete) {
-    return $theme_registry->get();
-  }
-  else {
-    return $theme_registry->getRuntime();
-  }
-}
-
-/**
- * Forces the system to rebuild the theme registry.
- *
- * This function should be called when modules are added to the system, or when
- * a dynamic system needs to add more theme hooks.
- */
-function drupal_theme_rebuild() {
-  \Drupal::service('theme.registry')->reset();
-}
-
-/**
- * Allows themes and/or theme engines to discover overridden theme functions.
- *
- * @param array $cache
- *   The existing cache of theme hooks to test against.
- * @param array $prefixes
- *   An array of prefixes to test, in reverse order of importance.
- *
- * @return array
- *   The functions found, suitable for returning from hook_theme;
- */
-function drupal_find_theme_functions($cache, $prefixes) {
-  $implementations = [];
-  $grouped_functions = \Drupal::service('theme.registry')->getPrefixGroupedUserFunctions();
-
-  foreach ($cache as $hook => $info) {
-    foreach ($prefixes as $prefix) {
-      // Find theme functions that implement possible "suggestion" variants of
-      // registered theme hooks and add those as new registered theme hooks.
-      // The 'pattern' key defines a common prefix that all suggestions must
-      // start with. The default is the name of the hook followed by '__'. An
-      // 'base hook' key is added to each entry made for a found suggestion,
-      // so that common functionality can be implemented for all suggestions of
-      // the same base hook. To keep things simple, deep hierarchy of
-      // suggestions is not supported: each suggestion's 'base hook' key
-      // refers to a base hook, not to another suggestion, and all suggestions
-      // are found using the base hook's pattern, not a pattern from an
-      // intermediary suggestion.
-      $pattern = isset($info['pattern']) ? $info['pattern'] : ($hook . '__');
-      // Grep only the functions which are within the prefix group.
-      list($first_prefix,) = explode('_', $prefix, 2);
-      if (!isset($info['base hook']) && !empty($pattern) && isset($grouped_functions[$first_prefix])) {
-        $matches = preg_grep('/^' . $prefix . '_' . $pattern . '/', $grouped_functions[$first_prefix]);
-        if ($matches) {
-          foreach ($matches as $match) {
-            $new_hook = substr($match, strlen($prefix) + 1);
-            $arg_name = isset($info['variables']) ? 'variables' : 'render element';
-            $implementations[$new_hook] = array(
-              'function' => $match,
-              $arg_name => $info[$arg_name],
-              'base hook' => $hook,
-            );
-          }
-        }
-      }
-      // Find theme functions that implement registered theme hooks and include
-      // that in what is returned so that the registry knows that the theme has
-      // this implementation.
-      if (function_exists($prefix . '_' . $hook)) {
-        $implementations[$hook] = array(
-          'function' => $prefix . '_' . $hook,
-        );
-      }
-    }
-  }
-
-  return $implementations;
-}
-
-/**
- * Allows themes and/or theme engines to easily discover overridden templates.
- *
- * @param $cache
- *   The existing cache of theme hooks to test against.
- * @param $extension
- *   The extension that these templates will have.
- * @param $path
- *   The path to search.
- */
-function drupal_find_theme_templates($cache, $extension, $path) {
-  $implementations = array();
-
-  // Collect paths to all sub-themes grouped by base themes. These will be
-  // used for filtering. This allows base themes to have sub-themes in its
-  // folder hierarchy without affecting the base themes template discovery.
-  $theme_paths = array();
-  foreach (\Drupal::service('theme_handler')->listInfo() as $theme_info) {
-    if (!empty($theme_info->base_theme)) {
-      $theme_paths[$theme_info->base_theme][$theme_info->getName()] = $theme_info->getPath();
-    }
-  }
-  foreach ($theme_paths as $basetheme => $subthemes) {
-    foreach ($subthemes as $subtheme => $subtheme_path) {
-      if (isset($theme_paths[$subtheme])) {
-        $theme_paths[$basetheme] = array_merge($theme_paths[$basetheme], $theme_paths[$subtheme]);
-      }
-    }
-  }
-  $theme = \Drupal::theme()->getActiveTheme()->getName();
-  $subtheme_paths = isset($theme_paths[$theme]) ? $theme_paths[$theme] : array();
-
-  // Escape the periods in the extension.
-  $regex = '/' . str_replace('.', '\.', $extension) . '$/';
-  // Get a listing of all template files in the path to search.
-  $files = file_scan_directory($path, $regex, array('key' => 'filename'));
-
-  // Find templates that implement registered theme hooks and include that in
-  // what is returned so that the registry knows that the theme has this
-  // implementation.
-  foreach ($files as $template => $file) {
-    // Ignore sub-theme templates for the current theme.
-    if (strpos($file->uri, str_replace($subtheme_paths, '', $file->uri)) !== 0) {
-      continue;
-    }
-    // Remove the extension from the filename.
-    $template = str_replace($extension, '', $template);
-    // Transform - in filenames to _ to match function naming scheme
-    // for the purposes of searching.
-    $hook = strtr($template, '-', '_');
-    if (isset($cache[$hook])) {
-      $implementations[$hook] = array(
-        'template' => $template,
-        'path' => dirname($file->uri),
-      );
-    }
-
-    // Match templates based on the 'template' filename.
-    foreach ($cache as $hook => $info) {
-      if (isset($info['template'])) {
-        $template_candidates = array($info['template'], str_replace($info['theme path'] . '/templates/', '', $info['template']));
-        if (in_array($template, $template_candidates)) {
-          $implementations[$hook] = array(
-            'template' => $template,
-            'path' => dirname($file->uri),
-          );
-        }
-      }
-    }
-  }
-
-  // Find templates that implement possible "suggestion" variants of registered
-  // theme hooks and add those as new registered theme hooks. See
-  // drupal_find_theme_functions() for more information about suggestions and
-  // the use of 'pattern' and 'base hook'.
-  $patterns = array_keys($files);
-  foreach ($cache as $hook => $info) {
-    $pattern = isset($info['pattern']) ? $info['pattern'] : ($hook . '__');
-    if (!isset($info['base hook']) && !empty($pattern)) {
-      // Transform _ in pattern to - to match file naming scheme
-      // for the purposes of searching.
-      $pattern = strtr($pattern, '_', '-');
-
-      $matches = preg_grep('/^' . $pattern . '/', $patterns);
-      if ($matches) {
-        foreach ($matches as $match) {
-          $file = $match;
-          // Remove the extension from the filename.
-          $file = str_replace($extension, '', $file);
-          // Put the underscores back in for the hook name and register this
-          // pattern.
-          $arg_name = isset($info['variables']) ? 'variables' : 'render element';
-          $implementations[strtr($file, '-', '_')] = array(
-            'template' => $file,
-            'path' => dirname($files[$match]->uri),
-            $arg_name => $info[$arg_name],
-            'base hook' => $hook,
-          );
-        }
-      }
-    }
-  }
-  return $implementations;
-}
-
-/**
- * Retrieves a setting for the current theme or for a given theme.
- *
- * The final setting is obtained from the last value found in the following
- * sources:
- * - the saved values from the global theme settings form
- * - the saved values from the theme's settings form
- * To only retrieve the default global theme setting, an empty string should be
- * given for $theme.
- *
- * @param $setting_name
- *   The name of the setting to be retrieved.
- * @param $theme
- *   The name of a given theme; defaults to the current theme.
- *
- * @return
- *   The value of the requested setting, NULL if the setting does not exist.
- */
-function theme_get_setting($setting_name, $theme = NULL) {
-  /** @var \Drupal\Core\Theme\ThemeSettings[] $cache */
-  $cache = &drupal_static(__FUNCTION__, array());
-
-  // If no key is given, use the current theme if we can determine it.
-  if (!isset($theme)) {
-    $theme = \Drupal::theme()->getActiveTheme()->getName();
-  }
-
-  if (empty($cache[$theme])) {
-    // Create a theme settings object.
-    $cache[$theme] = new ThemeSettings($theme);
-    // Get the global settings from configuration.
-    $cache[$theme]->setData(\Drupal::config('system.theme.global')->get());
-
-    // Get the values for the theme-specific settings from the .info.yml files
-    // of the theme and all its base themes.
-    $themes = \Drupal::service('theme_handler')->listInfo();
-    if (isset($themes[$theme])) {
-      $theme_object = $themes[$theme];
-
-      // Retrieve configured theme-specific settings, if any.
-      try {
-        if ($theme_settings = \Drupal::config($theme . '.settings')->get()) {
-          $cache[$theme]->merge($theme_settings);
-        }
-      }
-      catch (StorageException $e) {
-      }
-
-      // If the theme does not support a particular feature, override the global
-      // setting and set the value to NULL.
-      if (!empty($theme_object->info['features'])) {
-        foreach (_system_default_theme_features() as $feature) {
-          if (!in_array($feature, $theme_object->info['features'])) {
-            $cache[$theme]->set('features.' . $feature, NULL);
-          }
-        }
-      }
-
-      // Generate the path to the logo image.
-      if ($cache[$theme]->get('logo.use_default')) {
-        $cache[$theme]->set('logo.url', file_url_transform_relative(file_create_url($theme_object->getPath() . '/logo.svg')));
-      }
-      elseif ($logo_path = $cache[$theme]->get('logo.path')) {
-        $cache[$theme]->set('logo.url', file_url_transform_relative(file_create_url($logo_path)));
-      }
-
-      // Generate the path to the favicon.
-      if ($cache[$theme]->get('features.favicon')) {
-        $favicon_path = $cache[$theme]->get('favicon.path');
-        if ($cache[$theme]->get('favicon.use_default')) {
-          if (file_exists($favicon = $theme_object->getPath() . '/favicon.ico')) {
-            $cache[$theme]->set('favicon.url', file_url_transform_relative(file_create_url($favicon)));
-          }
-          else {
-            $cache[$theme]->set('favicon.url', file_url_transform_relative(file_create_url('core/misc/favicon.ico')));
-          }
-        }
-        elseif ($favicon_path) {
-          $cache[$theme]->set('favicon.url', file_url_transform_relative(file_create_url($favicon_path)));
-        }
-        else {
-          $cache[$theme]->set('features.favicon', FALSE);
-        }
-      }
-    }
-  }
-
-  return $cache[$theme]->get($setting_name);
-}
-
-/**
- * Escapes and renders variables for theme functions.
- *
- * This method is used in theme functions to ensure that the result is safe for
- * output inside HTML fragments. This mimics the behavior of the auto-escape
- * functionality in Twig.
- *
- * Note: This function should be kept in sync with
- * \Drupal\Core\Template\TwigExtension::escapeFilter().
- *
- * @param mixed $arg
- *   The string, object, or render array to escape if needed.
- *
- * @return string
- *   The rendered string, safe for use in HTML. The string is not safe when used
- *   as any part of an HTML attribute name or value.
- *
- * @throws \Exception
- *   Thrown when an object is passed in which cannot be printed.
- *
- * @see \Drupal\Core\Template\TwigExtension::escapeFilter()
- *
- * @todo Discuss deprecating this in https://www.drupal.org/node/2575081.
- * @todo Refactor this to keep it in sync with Twig filtering in
- *   https://www.drupal.org/node/2575065
- */
-function theme_render_and_autoescape($arg) {
-  if ($arg instanceof MarkupInterface) {
-    return (string) $arg;
-  }
-  $return = NULL;
-
-  if (is_scalar($arg)) {
-    $return = (string) $arg;
-  }
-  elseif (is_object($arg)) {
-    if ($arg instanceof RenderableInterface) {
-      $arg = $arg->toRenderable();
-    }
-    elseif (method_exists($arg, '__toString')) {
-      $return = (string) $arg;
-    }
-    // You can't throw exceptions in the magic PHP __toString methods, see
-    // http://php.net/manual/en/language.oop5.magic.php#object.tostring so
-    // we also support a toString method.
-    elseif (method_exists($arg, 'toString')) {
-      $return = $arg->toString();
-    }
-    else {
-      throw new \Exception('Object of type ' . get_class($arg) . ' cannot be printed.');
-    }
-  }
-
-  // We have a string or an object converted to a string: Escape it!
-  if (isset($return)) {
-    return SafeMarkup::isSafe($return, 'html') ? $return : Html::escape($return);
-  }
-
-  // This is a normal render array, which is safe by definition, with special
-  // simple cases already handled.
-
-  // Early return if this element was pre-rendered (no need to re-render).
-  if (isset($arg['#printed']) && $arg['#printed'] == TRUE && isset($arg['#markup']) && strlen($arg['#markup']) > 0) {
-    return (string) $arg['#markup'];
-  }
-  $arg['#printed'] = FALSE;
-  return (string) \Drupal::service('renderer')->render($arg);
-}
-
-/**
- * Converts theme settings to configuration.
- *
- * @see system_theme_settings_submit()
- *
- * @param array $theme_settings
- *   An array of theme settings from system setting form or a Drupal 7 variable.
- * @param Config $config
- *   The configuration object to update.
- *
- * @return
- *   The Config object with updated data.
- */
-function theme_settings_convert_to_config(array $theme_settings, Config $config) {
-  foreach ($theme_settings as $key => $value) {
-    if ($key == 'default_logo') {
-      $config->set('logo.use_default', $value);
-    }
-    elseif ($key == 'logo_path') {
-      $config->set('logo.path', $value);
-    }
-    elseif ($key == 'default_favicon') {
-      $config->set('favicon.use_default', $value);
-    }
-    elseif ($key == 'favicon_path') {
-      $config->set('favicon.path', $value);
-    }
-    elseif ($key == 'favicon_mimetype') {
-      $config->set('favicon.mimetype', $value);
-    }
-    elseif (substr($key, 0, 7) == 'toggle_') {
-      $config->set('features.' . Unicode::substr($key, 7), $value);
-    }
-    elseif (!in_array($key, array('theme', 'logo_upload'))) {
-      $config->set($key, $value);
-    }
-  }
-  return $config;
-}
-
-/**
- * Prepares variables for time templates.
- *
- * Default template: time.html.twig.
- *
- * @param array $variables
- *   An associative array possibly containing:
- *   - attributes['timestamp']:
- *   - timestamp:
- *   - text:
- */
-function template_preprocess_time(&$variables) {
-  // Format the 'datetime' attribute based on the timestamp.
-  // @see http://www.w3.org/TR/html5-author/the-time-element.html#attr-time-datetime
-  if (!isset($variables['attributes']['datetime']) && isset($variables['timestamp'])) {
-    $variables['attributes']['datetime'] = format_date($variables['timestamp'], 'html_datetime', '', 'UTC');
-  }
-
-  // If no text was provided, try to auto-generate it.
-  if (!isset($variables['text'])) {
-    // Format and use a human-readable version of the timestamp, if any.
-    if (isset($variables['timestamp'])) {
-      $variables['text'] = format_date($variables['timestamp']);
-    }
-    // Otherwise, use the literal datetime attribute.
-    elseif (isset($variables['attributes']['datetime'])) {
-      $variables['text'] = $variables['attributes']['datetime'];
-    }
-  }
-}
-
-/**
- * Prepares variables for datetime form element templates.
- *
- * The datetime form element serves as a wrapper around the date element type,
- * which creates a date and a time component for a date.
- *
- * Default template: datetime-form.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - element: An associative array containing the properties of the element.
- *     Properties used: #title, #value, #options, #description, #required,
- *     #attributes.
- *
- * @see form_process_datetime()
- */
-function template_preprocess_datetime_form(&$variables) {
-  $element = $variables['element'];
-
-  $variables['attributes'] = array();
-  if (isset($element['#id'])) {
-    $variables['attributes']['id'] = $element['#id'];
-  }
-  if (!empty($element['#attributes']['class'])) {
-    $variables['attributes']['class'] = (array) $element['#attributes']['class'];
-  }
-
-  $variables['content'] = $element;
-}
-
-/**
- * Prepares variables for datetime form wrapper templates.
- *
- * Default template: datetime-wrapper.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - element: An associative array containing the properties of the element.
- *     Properties used: #title, #children, #required, #attributes.
- */
-function template_preprocess_datetime_wrapper(&$variables) {
-  $element = $variables['element'];
-
-  if (!empty($element['#title'])) {
-    $variables['title'] = $element['#title'];
-  }
-
-  // Suppress error messages.
-  $variables['errors'] = NULL;
-
-  if (!empty($element['#description'])) {
-    $variables['description'] = $element['#description'];
-  }
-
-  $variables['required'] = FALSE;
-  // For required datetime fields 'form-required' & 'js-form-required' classes
-  // are appended to the label attributes.
-  if (!empty($element['#required'])) {
-    $variables['required'] = TRUE;
-  }
-  $variables['content'] = $element['#children'];
-}
-
-/**
- * Prepares variables for links templates.
- *
- * Default template: links.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - links: An associative array of links to be themed. The key for each link
- *     is used as its CSS class. Each link should be itself an array, with the
- *     following elements:
- *     - title: The link text.
- *     - url: (optional) The url object to link to. If omitted, no a tag is
- *       printed out.
- *     - attributes: (optional) Attributes for the anchor, or for the <span>
- *       tag used in its place if no 'href' is supplied. If element 'class' is
- *       included, it must be an array of one or more class names.
- *     If the 'href' element is supplied, the entire link array is passed to
- *     l() as its $options parameter.
- *   - attributes: A keyed array of attributes for the UL containing the
- *     list of links.
- *   - set_active_class: (optional) Whether each link should compare the
- *     route_name + route_parameters or href (path), language and query options
- *     to the current URL, to determine whether the link is "active". If so, an
- *     "active" class will be applied to the list item containing the link, as
- *     well as the link itself. It is important to use this sparingly since it
- *     is usually unnecessary and requires extra processing.
- *     For anonymous users, the "active" class will be calculated on the server,
- *     because most sites serve each anonymous user the same cached page anyway.
- *     For authenticated users, the "active" class will be calculated on the
- *     client (through JavaScript), only data- attributes are added to list
- *     items and contained links, to prevent breaking the render cache. The
- *     JavaScript is added in system_page_attachments().
- *   - heading: (optional) A heading to precede the links. May be an
- *     associative array or a string. If it's an array, it can have the
- *     following elements:
- *     - text: The heading text.
- *     - level: The heading level (e.g. 'h2', 'h3').
- *     - attributes: (optional) An array of the CSS attributes for the heading.
- *     When using a string it will be used as the text of the heading and the
- *     level will default to 'h2'. Headings should be used on navigation menus
- *     and any list of links that consistently appears on multiple pages. To
- *     make the heading invisible use the 'visually-hidden' CSS class. Do not
- *     use 'display:none', which removes it from screen readers and assistive
- *     technology. Headings allow screen reader and keyboard only users to
- *     navigate to or skip the links. See
- *     http://juicystudio.com/article/screen-readers-display-none.php and
- *     http://www.w3.org/TR/WCAG-TECHS/H42.html for more information.
- *
- * Unfortunately links templates duplicate the "active" class handling of l()
- * and LinkGenerator::generate() because it needs to be able to set the "active"
- * class not on the links themselves ("a" tags), but on the list items ("li"
- * tags) that contain the links. This is necessary for CSS to be able to style
- * list items differently when the link is active, since CSS does not yet allow
- * one to style list items only if it contains a certain element with a certain
- * class. I.e. we cannot yet convert this jQuery selector to a CSS selector:
- *   jQuery('li:has("a.is-active")')
- *
- * @see \Drupal\Core\Utility\LinkGenerator
- * @see \Drupal\Core\Utility\LinkGenerator::generate()
- * @see system_page_attachments()
- */
-function template_preprocess_links(&$variables) {
-  $links = $variables['links'];
-  $heading = &$variables['heading'];
-
-  if (!empty($links)) {
-    // Prepend the heading to the list, if any.
-    if (!empty($heading)) {
-      // Convert a string heading into an array, using a H2 tag by default.
-      if (is_string($heading)) {
-        $heading = array('text' => $heading);
-      }
-      // Merge in default array properties into $heading.
-      $heading += array(
-        'level' => 'h2',
-        'attributes' => array(),
-      );
-      // Convert the attributes array into an Attribute object.
-      $heading['attributes'] = new Attribute($heading['attributes']);
-    }
-
-    $variables['links'] = array();
-    foreach ($links as $key => $link) {
-      $item = array();
-      $link += array(
-        'ajax' => NULL,
-        'url' => NULL,
-      );
-
-      $li_attributes = array();
-      $keys = ['title', 'url'];
-      $link_element = array(
-        '#type' => 'link',
-        '#title' => $link['title'],
-        '#options' => array_diff_key($link, array_combine($keys, $keys)),
-        '#url' => $link['url'],
-        '#ajax' => $link['ajax'],
-      );
-
-      // Handle links and ensure that the active class is added on the LIs, but
-      // only if the 'set_active_class' option is not empty.
-      if (isset($link['url'])) {
-        if (!empty($variables['set_active_class'])) {
-
-          // Also enable set_active_class for the contained link.
-          $link_element['#options']['set_active_class'] = TRUE;
-
-          if (!empty($link['language'])) {
-            $li_attributes['hreflang'] = $link['language']->getId();
-          }
-
-          // Add a "data-drupal-link-query" attribute to let the
-          // drupal.active-link library know the query in a standardized manner.
-          if (!empty($link['query'])) {
-            $query = $link['query'];
-            ksort($query);
-            $li_attributes['data-drupal-link-query'] = Json::encode($query);
-          }
-
-          /** @var \Drupal\Core\Url $url */
-          $url = $link['url'];
-          if ($url->isRouted()) {
-            // Add a "data-drupal-link-system-path" attribute to let the
-            // drupal.active-link library know the path in a standardized manner.
-            $system_path = $url->getInternalPath();
-            // @todo System path is deprecated - use the route name and parameters.
-            // Special case for the front page.
-            $li_attributes['data-drupal-link-system-path'] = $system_path == '' ? '<front>' : $system_path;
-          }
-        }
-
-        $item['link'] = $link_element;
-      }
-
-      // Handle title-only text items.
-      $item['text'] = $link['title'];
-      if (isset($link['attributes'])) {
-        $item['text_attributes'] = new Attribute($link['attributes']);
-      }
-
-      // Handle list item attributes.
-      $item['attributes'] = new Attribute($li_attributes);
-
-      // Add the item to the list of links.
-      $variables['links'][$key] = $item;
-    }
-  }
-}
-
-/**
- * Prepares variables for image templates.
- *
- * Default template: image.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - uri: Either the path of the image file (relative to base_path()) or a
- *     full URL.
- *   - width: The width of the image (if known).
- *   - height: The height of the image (if known).
- *   - alt: The alternative text for text-based browsers. HTML 4 and XHTML 1.0
- *     always require an alt attribute. The HTML 5 draft allows the alt
- *     attribute to be omitted in some cases. Therefore, this variable defaults
- *     to an empty string, but can be set to NULL for the attribute to be
- *     omitted. Usually, neither omission nor an empty string satisfies
- *     accessibility requirements, so it is strongly encouraged for code
- *     building variables for image.html.twig templates to pass a meaningful
- *     value for this variable.
- *     - http://www.w3.org/TR/REC-html40/struct/objects.html#h-13.8
- *     - http://www.w3.org/TR/xhtml1/dtds.html
- *     - http://dev.w3.org/html5/spec/Overview.html#alt
- *   - title: The title text is displayed when the image is hovered in some
- *     popular browsers.
- *   - attributes: Associative array of attributes to be placed in the img tag.
- *   - srcset: Array of multiple URIs and sizes/multipliers.
- *   - sizes: The sizes attribute for viewport-based selection of images.
- *     - http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content.html#introduction-3:viewport-based-selection-2
- */
-function template_preprocess_image(&$variables) {
-  if (!empty($variables['uri'])) {
-    $variables['attributes']['src'] = file_url_transform_relative(file_create_url($variables['uri']));
-  }
-  // Generate a srcset attribute conforming to the spec at
-  // http://www.w3.org/html/wg/drafts/html/master/embedded-content.html#attr-img-srcset
-  if (!empty($variables['srcset'])) {
-    $srcset = array();
-    foreach ($variables['srcset'] as $src) {
-      // URI is mandatory.
-      $source = file_url_transform_relative(file_create_url($src['uri']));
-      if (isset($src['width']) && !empty($src['width'])) {
-        $source .= ' ' . $src['width'];
-      }
-      elseif (isset($src['multiplier']) && !empty($src['multiplier'])) {
-        $source .= ' ' . $src['multiplier'];
-      }
-      $srcset[] = $source;
-    }
-    $variables['attributes']['srcset'] = implode(', ', $srcset);
-  }
-
-  foreach (array('width', 'height', 'alt', 'title', 'sizes') as $key) {
-    if (isset($variables[$key])) {
-      // If the property has already been defined in the attributes,
-      // do not override, including NULL.
-      if (array_key_exists($key, $variables['attributes'])) {
-        continue;
-      }
-      $variables['attributes'][$key] = $variables[$key];
-    }
-  }
-}
-
-/**
- * Prepares variables for table templates.
- *
- * Default template: table.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - header: An array containing the table headers. Each element of the array
- *     can be either a localized string or an associative array with the
- *     following keys:
- *     - data: The localized title of the table column, as a string or render
- *       array.
- *     - field: The database field represented in the table column (required
- *       if user is to be able to sort on this column).
- *     - sort: A default sort order for this column ("asc" or "desc"). Only
- *       one column should be given a default sort order because table sorting
- *       only applies to one column at a time.
- *     - class: An array of values for the 'class' attribute. In particular,
- *       the least important columns that can be hidden on narrow and medium
- *       width screens should have a 'priority-low' class, referenced with the
- *       RESPONSIVE_PRIORITY_LOW constant. Columns that should be shown on
- *       medium+ wide screens should be marked up with a class of
- *       'priority-medium', referenced by with the RESPONSIVE_PRIORITY_MEDIUM
- *       constant. Themes may hide columns with one of these two classes on
- *       narrow viewports to save horizontal space.
- *     - Any HTML attributes, such as "colspan", to apply to the column header
- *       cell.
- *   - rows: An array of table rows. Every row is an array of cells, or an
- *     associative array with the following keys:
- *     - data: An array of cells.
- *     - Any HTML attributes, such as "class", to apply to the table row.
- *     - no_striping: A Boolean indicating that the row should receive no
- *       'even / odd' styling. Defaults to FALSE.
- *     Each cell can be either a string or an associative array with the
- *     following keys:
- *     - data: The string or render array to display in the table cell.
- *     - header: Indicates this cell is a header.
- *     - Any HTML attributes, such as "colspan", to apply to the table cell.
- *     Here's an example for $rows:
- *     @code
- *     $rows = array(
- *       // Simple row
- *       array(
- *         'Cell 1', 'Cell 2', 'Cell 3'
- *       ),
- *       // Row with attributes on the row and some of its cells.
- *       array(
- *         'data' => array('Cell 1', array('data' => 'Cell 2', 'colspan' => 2)), 'class' => array('funky')
- *       ),
- *     );
- *     @endcode
- *   - footer: An array of table rows which will be printed within a <tfoot>
- *     tag, in the same format as the rows element (see above).
- *   - attributes: An array of HTML attributes to apply to the table tag.
- *   - caption: A localized string to use for the <caption> tag.
- *   - colgroups: An array of column groups. Each element of the array can be
- *     either:
- *     - An array of columns, each of which is an associative array of HTML
- *       attributes applied to the COL element.
- *     - An array of attributes applied to the COLGROUP element, which must
- *       include a "data" attribute. To add attributes to COL elements, set the
- *       "data" attribute with an array of columns, each of which is an
- *       associative array of HTML attributes.
- *     Here's an example for $colgroup:
- *     @code
- *     $colgroup = array(
- *       // COLGROUP with one COL element.
- *       array(
- *         array(
- *           'class' => array('funky'), // Attribute for the COL element.
- *         ),
- *       ),
- *       // Colgroup with attributes and inner COL elements.
- *       array(
- *         'data' => array(
- *           array(
- *             'class' => array('funky'), // Attribute for the COL element.
- *           ),
- *         ),
- *         'class' => array('jazzy'), // Attribute for the COLGROUP element.
- *       ),
- *     );
- *     @endcode
- *     These optional tags are used to group and set properties on columns
- *     within a table. For example, one may easily group three columns and
- *     apply same background style to all.
- *   - sticky: Use a "sticky" table header.
- *   - empty: The message to display in an extra row if table does not have any
- *     rows.
- */
-function template_preprocess_table(&$variables) {
-  // Format the table columns:
-  if (!empty($variables['colgroups'])) {
-    foreach ($variables['colgroups'] as &$colgroup) {
-      // Check if we're dealing with a simple or complex column
-      if (isset($colgroup['data'])) {
-        $cols = $colgroup['data'];
-        unset($colgroup['data']);
-        $colgroup_attributes = $colgroup;
-      }
-      else {
-        $cols = $colgroup;
-        $colgroup_attributes = array();
-      }
-      $colgroup = array();
-      $colgroup['attributes'] = new Attribute($colgroup_attributes);
-      $colgroup['cols'] = array();
-
-      // Build columns.
-      if (is_array($cols) && !empty($cols)) {
-        foreach ($cols as $col_key => $col) {
-          $colgroup['cols'][$col_key]['attributes'] = new Attribute($col);
-        }
-      }
-    }
-  }
-
-  // Build an associative array of responsive classes keyed by column.
-  $responsive_classes = array();
-
-  // Format the table header:
-  $ts = array();
-  $header_columns = 0;
-  if (!empty($variables['header'])) {
-    $ts = tablesort_init($variables['header']);
-
-    // Use a separate index with responsive classes as headers
-    // may be associative.
-    $responsive_index = -1;
-    foreach ($variables['header'] as $col_key => $cell) {
-      // Increase the responsive index.
-      $responsive_index++;
-
-      if (!is_array($cell)) {
-        $header_columns++;
-        $cell_content = $cell;
-        $cell_attributes = new Attribute();
-        $is_header = TRUE;
-      }
-      else {
-        if (isset($cell['colspan'])) {
-          $header_columns += $cell['colspan'];
-        }
-        else {
-          $header_columns++;
-        }
-        $cell_content = '';
-        if (isset($cell['data'])) {
-          $cell_content = $cell['data'];
-          unset($cell['data']);
-        }
-        // Flag the cell as a header or not and remove the flag.
-        $is_header = isset($cell['header']) ? $cell['header'] : TRUE;
-        unset($cell['header']);
-
-        // Track responsive classes for each column as needed. Only the header
-        // cells for a column are marked up with the responsive classes by a
-        // module developer or themer. The responsive classes on the header cells
-        // must be transferred to the content cells.
-        if (!empty($cell['class']) && is_array($cell['class'])) {
-          if (in_array(RESPONSIVE_PRIORITY_MEDIUM, $cell['class'])) {
-            $responsive_classes[$responsive_index] = RESPONSIVE_PRIORITY_MEDIUM;
-          }
-          elseif (in_array(RESPONSIVE_PRIORITY_LOW, $cell['class'])) {
-            $responsive_classes[$responsive_index] = RESPONSIVE_PRIORITY_LOW;
-          }
-        }
-
-        tablesort_header($cell_content, $cell, $variables['header'], $ts);
-
-        // tablesort_header() removes the 'sort' and 'field' keys.
-        $cell_attributes = new Attribute($cell);
-      }
-      $variables['header'][$col_key] = array();
-      $variables['header'][$col_key]['tag'] = $is_header ? 'th' : 'td';
-      $variables['header'][$col_key]['attributes'] = $cell_attributes;
-      $variables['header'][$col_key]['content'] = $cell_content;
-    }
-  }
-  $variables['header_columns'] = $header_columns;
-
-  // Rows and footer have the same structure.
-  $sections = array('rows' , 'footer');
-  foreach ($sections as $section) {
-    if (!empty($variables[$section])) {
-      foreach ($variables[$section] as $row_key => $row) {
-        $cells = $row;
-        $row_attributes = array();
-
-        // Check if we're dealing with a simple or complex row
-        if (isset($row['data'])) {
-          $cells = $row['data'];
-          $variables['no_striping'] = isset($row['no_striping']) ? $row['no_striping'] : FALSE;
-
-          // Set the attributes array and exclude 'data' and 'no_striping'.
-          $row_attributes = $row;
-          unset($row_attributes['data']);
-          unset($row_attributes['no_striping']);
-        }
-
-        // Build row.
-        $variables[$section][$row_key] = array();
-        $variables[$section][$row_key]['attributes'] = new Attribute($row_attributes);
-        $variables[$section][$row_key]['cells'] = array();
-        if (!empty($cells)) {
-          // Reset the responsive index.
-          $responsive_index = -1;
-          foreach ($cells as $col_key => $cell) {
-            // Increase the responsive index.
-            $responsive_index++;
-
-            if (!is_array($cell)) {
-              $cell_content = $cell;
-              $cell_attributes = array();
-              $is_header = FALSE;
-            }
-            else {
-              $cell_content = '';
-              if (isset($cell['data'])) {
-                $cell_content = $cell['data'];
-                unset($cell['data']);
-              }
-
-              // Flag the cell as a header or not and remove the flag.
-              $is_header = !empty($cell['header']);
-              unset($cell['header']);
-
-              $cell_attributes = $cell;
-            }
-            // Active table sort information.
-            if (isset($variables['header'][$col_key]['data']) && $variables['header'][$col_key]['data'] == $ts['name'] && !empty($variables['header'][$col_key]['field'])) {
-              $variables[$section][$row_key]['cells'][$col_key]['active_table_sort'] = TRUE;
-            }
-            // Copy RESPONSIVE_PRIORITY_LOW/RESPONSIVE_PRIORITY_MEDIUM
-            // class from header to cell as needed.
-            if (isset($responsive_classes[$responsive_index])) {
-              $cell_attributes['class'][] = $responsive_classes[$responsive_index];
-            }
-            $variables[$section][$row_key]['cells'][$col_key]['tag'] = $is_header ? 'th' : 'td';
-            $variables[$section][$row_key]['cells'][$col_key]['attributes'] = new Attribute($cell_attributes);
-            $variables[$section][$row_key]['cells'][$col_key]['content'] = $cell_content;
-          }
-        }
-      }
-    }
-  }
-  if (empty($variables['no_striping'])) {
-    $variables['attributes']['data-striping'] = 1;
-  }
-}
-
-/**
- * Prepares variables for item list templates.
- *
- * Default template: item-list.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - items: An array of items to be displayed in the list. Each item can be
- *     either a string or a render array. If #type, #theme, or #markup
- *     properties are not specified for child render arrays, they will be
- *     inherited from the parent list, allowing callers to specify larger
- *     nested lists without having to explicitly specify and repeat the
- *     render properties for all nested child lists.
- *   - title: A title to be prepended to the list.
- *   - list_type: The type of list to return (e.g. "ul", "ol").
- *
- * @see https://www.drupal.org/node/1842756
- */
-function template_preprocess_item_list(&$variables) {
-  $variables['wrapper_attributes'] = new Attribute($variables['wrapper_attributes']);
-  foreach ($variables['items'] as &$item) {
-    $attributes = array();
-    // If the item value is an array, then it is a render array.
-    if (is_array($item)) {
-      // List items support attributes via the '#wrapper_attributes' property.
-      if (isset($item['#wrapper_attributes'])) {
-        $attributes = $item['#wrapper_attributes'];
-      }
-      // Determine whether there are any child elements in the item that are not
-      // fully-specified render arrays. If there are any, then the child
-      // elements present nested lists and we automatically inherit the render
-      // array properties of the current list to them.
-      foreach (Element::children($item) as $key) {
-        $child = &$item[$key];
-        // If this child element does not specify how it can be rendered, then
-        // we need to inherit the render properties of the current list.
-        if (!isset($child['#type']) && !isset($child['#theme']) && !isset($child['#markup'])) {
-          // Since item-list.html.twig supports both strings and render arrays
-          // as items, the items of the nested list may have been specified as
-          // the child elements of the nested list, instead of #items. For
-          // convenience, we automatically move them into #items.
-          if (!isset($child['#items'])) {
-            // This is the same condition as in
-            // \Drupal\Core\Render\Element::children(), which cannot be used
-            // here, since it triggers an error on string values.
-            foreach ($child as $child_key => $child_value) {
-              if ($child_key[0] !== '#') {
-                $child['#items'][$child_key] = $child_value;
-                unset($child[$child_key]);
-              }
-            }
-          }
-          // Lastly, inherit the original theme variables of the current list.
-          $child['#theme'] = $variables['theme_hook_original'];
-          $child['#list_type'] = $variables['list_type'];
-        }
-      }
-    }
-
-    // Set the item's value and attributes for the template.
-    $item = array(
-      'value' => $item,
-      'attributes' => new Attribute($attributes),
-    );
-  }
-}
-
-/**
- * Prepares variables for container templates.
- *
- * Default template: container.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - element: An associative array containing the properties of the element.
- *     Properties used: #id, #attributes, #children.
- */
-function template_preprocess_container(&$variables) {
-  $variables['has_parent'] = FALSE;
-  $element = $variables['element'];
-  // Ensure #attributes is set.
-  $element += array('#attributes' => array());
-
-  // Special handling for form elements.
-  if (isset($element['#array_parents'])) {
-    // Assign an html ID.
-    if (!isset($element['#attributes']['id'])) {
-      $element['#attributes']['id'] = $element['#id'];
-    }
-    $variables['has_parent'] = TRUE;
-  }
-
-  $variables['children'] = $element['#children'];
-  $variables['attributes'] = $element['#attributes'];
-}
-
-/**
- * Prepares variables for maintenance task list templates.
- *
- * Default template: maintenance-task-list.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - items: An associative array of maintenance tasks.
- *     It's the caller's responsibility to ensure this array's items contain no
- *     dangerous HTML such as SCRIPT tags.
- *   - active: The key for the currently active maintenance task.
- */
-function template_preprocess_maintenance_task_list(&$variables) {
-  $items = $variables['items'];
-  $active = $variables['active'];
-
-  $done = isset($items[$active]) || $active == NULL;
-  foreach ($items as $k => $item) {
-    $variables['tasks'][$k]['item'] = $item;
-    $variables['tasks'][$k]['attributes'] = new Attribute();
-    if ($active == $k) {
-      $variables['tasks'][$k]['attributes']->addClass('is-active');
-      $variables['tasks'][$k]['status'] = t('active');
-      $done = FALSE;
-    }
-    else {
-      if ($done) {
-        $variables['tasks'][$k]['attributes']->addClass('done');
-        $variables['tasks'][$k]['status'] = t('done');
-      }
-    }
-  }
-}
-
-/**
- * Adds a default set of helper variables for preprocessors and templates.
- *
- * This function is called for theme hooks implemented as templates only, not
- * for theme hooks implemented as functions. This preprocess function is the
- * first in the sequence of preprocessing functions that are called when
- * preparing variables for a template.
- *
- * See the @link themeable Default theme implementations topic @endlink for
- * details.
- */
-function template_preprocess(&$variables, $hook, $info) {
-  // Merge in variables that don't depend on hook and don't change during a
-  // single page request.
-  // Use the advanced drupal_static() pattern, since this is called very often.
-  static $drupal_static_fast;
-  if (!isset($drupal_static_fast)) {
-    $drupal_static_fast['default_variables'] = &drupal_static(__FUNCTION__);
-  }
-  $default_variables = &$drupal_static_fast['default_variables'];
-  if (!isset($default_variables)) {
-    $default_variables = _template_preprocess_default_variables();
-  }
-  $variables += $default_variables;
-
-  // When theming a render element, merge its #attributes into
-  // $variables['attributes'].
-  if (isset($info['render element'])) {
-    $key = $info['render element'];
-    if (isset($variables[$key]['#attributes'])) {
-      $variables['attributes'] = NestedArray::mergeDeep($variables['attributes'], $variables[$key]['#attributes']);
-    }
-  }
-}
-
-/**
- * Returns hook-independent variables to template_preprocess().
- */
-function _template_preprocess_default_variables() {
-  // Variables that don't depend on a database connection.
-  $variables = array(
-    'attributes' => array(),
-    'title_attributes' => array(),
-    'content_attributes' => array(),
-    'title_prefix' => array(),
-    'title_suffix' => array(),
-    'db_is_active' => !defined('MAINTENANCE_MODE'),
-    'is_admin' => FALSE,
-    'logged_in' => FALSE,
-  );
-
-  // Give modules a chance to alter the default template variables.
-  \Drupal::moduleHandler()->alter('template_preprocess_default_variables', $variables);
-
-  // Tell all templates where they are located.
-  $variables['directory'] = \Drupal::theme()->getActiveTheme()->getPath();
-
-  return $variables;
-}
-
-/**
- * Prepares variables for HTML document templates.
- *
- * Default template: html.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - page: A render element representing the page.
- */
-function template_preprocess_html(&$variables) {
-  $variables['page'] = $variables['html']['page'];
-  unset($variables['html']['page']);
-  $variables['page_top'] = NULL;
-  if (isset($variables['html']['page_top'])) {
-    $variables['page_top'] = $variables['html']['page_top'];
-    unset($variables['html']['page_top']);
-  }
-  $variables['page_bottom'] = NULL;
-  if (isset($variables['html']['page_bottom'])) {
-    $variables['page_bottom'] = $variables['html']['page_bottom'];
-    unset($variables['html']['page_bottom']);
-  }
-
-  $variables['html_attributes'] = new Attribute();
-
-  // HTML element attributes.
-  $language_interface = \Drupal::languageManager()->getCurrentLanguage();
-  $variables['html_attributes']['lang'] = $language_interface->getId();
-  $variables['html_attributes']['dir'] = $language_interface->getDirection();
-
-  if (isset($variables['db_is_active']) && !$variables['db_is_active']) {
-    $variables['db_offline'] = TRUE;
-  }
-
-  // Add a variable for the root path. This can be used to create a class and
-  // theme the page depending on the current path (e.g. node, admin, user) as
-  // well as more specific data like path-frontpage.
-  $is_front_page =  \Drupal::service('path.matcher')->isFrontPage();
-
-  if ($is_front_page) {
-    $variables['root_path'] = FALSE;
-  }
-  else {
-    $system_path = \Drupal::service('path.current')->getPath();
-    $variables['root_path'] = explode('/', $system_path)[1];
-  }
-
-  $site_config = \Drupal::config('system.site');
-  // Construct page title.
-  if (isset($variables['page']['#title']) && is_array($variables['page']['#title'])) {
-    // Do an early render if the title is a render array.
-    $variables['page']['#title'] = (string) \Drupal::service('renderer')->render($variables['page']['#title']);
-  }
-  if (!empty($variables['page']['#title'])) {
-    $head_title = array(
-      // Marking the title as safe since it has had the tags stripped.
-      'title' => Markup::create(trim(strip_tags($variables['page']['#title']))),
-      'name' => $site_config->get('name'),
-    );
-  }
-  // @todo Remove once views is not bypassing the view subscriber anymore.
-  //   @see https://www.drupal.org/node/2068471
-  elseif ($is_front_page) {
-    $head_title = array(
-      'title' => t('Home'),
-      'name' => $site_config->get('name'),
-    );
-  }
-  else {
-    $head_title = ['name' => $site_config->get('name')];
-    if ($site_config->get('slogan')) {
-      $head_title['slogan'] = strip_tags($site_config->get('slogan'));
-    }
-  }
-
-  $variables['head_title'] = $head_title;
-  // @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0.
-  $variables['head_title_array'] = $head_title;
-
-  // Create placeholder strings for these keys.
-  // @see \Drupal\Core\Render\HtmlResponseSubscriber
-  $types = [
-    'styles' => 'css',
-    'scripts' => 'js',
-    'scripts_bottom' => 'js-bottom',
-    'head' => 'head',
-  ];
-  $variables['placeholder_token'] = Crypt::randomBytesBase64(55);
-  foreach ($types as $type => $placeholder_name) {
-    $placeholder = '<' . $placeholder_name . '-placeholder token="' . $variables['placeholder_token'] . '">';
-    $variables['#attached']['html_response_attachment_placeholders'][$type] = $placeholder;
-  }
-}
-
-/**
- * Prepares variables for the page template.
- *
- * Default template: page.html.twig.
- *
- * See the page.html.twig template for the list of variables.
- */
-function template_preprocess_page(&$variables) {
-  $language_interface = \Drupal::languageManager()->getCurrentLanguage();
-
-  foreach (\Drupal::theme()->getActiveTheme()->getRegions() as $region) {
-    if (!isset($variables['page'][$region])) {
-      $variables['page'][$region] = array();
-    }
-  }
-
-  $variables['base_path']         = base_path();
-  $variables['front_page']        = \Drupal::url('<front>');
-  $variables['language']          = $language_interface;
-
-  // An exception might be thrown.
-  try {
-    $variables['is_front'] = \Drupal::service('path.matcher')->isFrontPage();
-  }
-  catch (Exception $e) {
-    // If the database is not yet available, set default values for these
-    // variables.
-    $variables['is_front'] = FALSE;
-    $variables['db_is_active'] = FALSE;
-  }
-
-  if ($node = \Drupal::routeMatch()->getParameter('node')) {
-    $variables['node'] = $node;
-  }
-}
-
-/**
- * Generate an array of suggestions from path arguments.
- *
- * This is typically called for adding to the suggestions in
- * hook_theme_suggestions_HOOK_alter() or adding to 'attributes' class key
- * variables from within preprocess functions, when wanting to base the
- * additional suggestions or classes on the path of the current page.
- *
- * @param $args
- *   An array of path arguments.
- * @param $base
- *   A string identifying the base 'thing' from which more specific suggestions
- *   are derived. For example, 'page' or 'html'.
- * @param $delimiter
- *   The string used to delimit increasingly specific information. The default
- *   of '__' is appropriate for theme hook suggestions. '-' is appropriate for
- *   extra classes.
- *
- * @return
- *   An array of suggestions, suitable for adding to
- *   hook_theme_suggestions_HOOK_alter() or to $variables['attributes']['class']
- *   if the suggestions represent extra CSS classes.
- */
-function theme_get_suggestions($args, $base, $delimiter = '__') {
-
-  // Build a list of suggested theme hooks in order of
-  // specificity. One suggestion is made for every element of the current path,
-  // though numeric elements are not carried to subsequent suggestions. For
-  // example, for $base='page', http://www.example.com/node/1/edit would result
-  // in the following suggestions:
-  //
-  // page__node
-  // page__node__%
-  // page__node__1
-  // page__node__edit
-
-  $suggestions = array();
-  $prefix = $base;
-  foreach ($args as $arg) {
-    // Remove slashes or null per SA-CORE-2009-003 and change - (hyphen) to _
-    // (underscore).
-    //
-    // When we discover templates in @see drupal_find_theme_templates,
-    // hyphens (-) are converted to underscores (_) before the theme hook
-    // is registered. We do this because the hyphens used for delimiters
-    // in hook suggestions cannot be used in the function names of the
-    // associated preprocess functions. Any page templates designed to be used
-    // on paths that contain a hyphen are also registered with these hyphens
-    // converted to underscores so here we must convert any hyphens in path
-    // arguments to underscores here before fetching theme hook suggestions
-    // to ensure the templates are appropriately recognized.
-    $arg = str_replace(array("/", "\\", "\0", '-'), array('', '', '', '_'), $arg);
-    // The percent acts as a wildcard for numeric arguments since
-    // asterisks are not valid filename characters on many filesystems.
-    if (is_numeric($arg)) {
-      $suggestions[] = $prefix . $delimiter . '%';
-    }
-    $suggestions[] = $prefix . $delimiter . $arg;
-    if (!is_numeric($arg)) {
-      $prefix .= $delimiter . $arg;
-    }
-  }
-  if (\Drupal::service('path.matcher')->isFrontPage()) {
-    // Front templates should be based on root only, not prefixed arguments.
-    $suggestions[] = $base . $delimiter . 'front';
-  }
-
-  return $suggestions;
-}
-
-/**
- * Prepares variables for maintenance page templates.
- *
- * Default template: maintenance-page.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - content - An array of page content.
- *
- * @see system_page_attachments()
- */
-function template_preprocess_maintenance_page(&$variables) {
-  // @todo Rename the templates to page--maintenance + page--install.
-  template_preprocess_page($variables);
-
-  // @see system_page_attachments()
-  $variables['#attached']['library'][] = 'system/maintenance';
-
-  // Maintenance page and install page need branding info in variables because
-  // there is no blocks.
-  $site_config = \Drupal::config('system.site');
-  $variables['logo'] = theme_get_setting('logo.url');
-  $variables['site_name'] = $site_config->get('name');
-  $variables['site_slogan'] = $site_config->get('slogan');
-
-  // Maintenance page and install page need page title in variable because there
-  // are no blocks.
-  $variables['title'] = $variables['page']['#title'];
-}
-
-/**
- * Prepares variables for install page templates.
- *
- * Default template: install-page.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - content - An array of page content.
- *
- * @see template_preprocess_maintenance_page()
- */
-function template_preprocess_install_page(&$variables) {
-  template_preprocess_maintenance_page($variables);
-
-  // Override the site name that is displayed on the page, since Drupal is
-  // still in the process of being installed.
-  $distribution_name = drupal_install_profile_distribution_name();
-  $variables['site_name'] = $distribution_name;
-  $variables['site_version'] = drupal_install_profile_distribution_version();
-}
-
-/**
- * Prepares variables for region templates.
- *
- * Default template: region.html.twig.
- *
- * Prepares the values passed to the theme_region function to be passed into a
- * pluggable template engine. Uses the region name to generate a template file
- * suggestions.
- *
- * @param array $variables
- *   An associative array containing:
- *   - elements: An associative array containing properties of the region.
- */
-function template_preprocess_region(&$variables) {
-  // Create the $content variable that templates expect.
-  $variables['content'] = $variables['elements']['#children'];
-  $variables['region'] = $variables['elements']['#region'];
-}
-
-/**
- * Prepares variables for field templates.
- *
- * Default template: field.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - element: A render element representing the field.
- *   - attributes: A string containing the attributes for the wrapping div.
- *   - title_attributes: A string containing the attributes for the title.
- */
-function template_preprocess_field(&$variables, $hook) {
-  $element = $variables['element'];
-
-  // Creating variables for the template.
-  $variables['entity_type'] = $element['#entity_type'];
-  $variables['field_name'] = $element['#field_name'];
-  $variables['field_type'] = $element['#field_type'];
-  $variables['label_display'] = $element['#label_display'];
-
-  $variables['label_hidden'] = ($element['#label_display'] == 'hidden');
-  // Always set the field label - allow themes to decide whether to display it.
-  // In addition the label should be rendered but hidden to support screen
-  // readers.
-  $variables['label'] = $element['#title'];
-
-  $variables['multiple'] = $element['#is_multiple'];
-
-  static $default_attributes;
-  if (!isset($default_attributes)) {
-    $default_attributes = new Attribute;
-  }
-
-  // Merge attributes when a single-value field has a hidden label.
-  if ($element['#label_display'] == 'hidden' && !$variables['multiple'] && !empty($element['#items'][0]->_attributes)) {
-    $variables['attributes'] = NestedArray::mergeDeep($variables['attributes'], (array) $element['#items'][0]->_attributes);
-  }
-
-  // We want other preprocess functions and the theme implementation to have
-  // fast access to the field item render arrays. The item render array keys
-  // (deltas) should always be numerically indexed starting from 0, and looping
-  // on those keys is faster than calling Element::children() or looping on all
-  // keys within $element, since that requires traversal of all element
-  // properties.
-  $variables['items'] = array();
-  $delta = 0;
-  while (!empty($element[$delta])) {
-    $variables['items'][$delta]['content'] = $element[$delta];
-
-    // Modules (e.g., rdf.module) can add field item attributes (to
-    // $item->_attributes) within hook_entity_prepare_view(). Some field
-    // formatters move those attributes into some nested formatter-specific
-    // element in order have them rendered on the desired HTML element (e.g., on
-    // the <a> element of a field item being rendered as a link). Other field
-    // formatters leave them within $element['#items'][$delta]['_attributes'] to
-    // be rendered on the item wrappers provided by field.html.twig.
-    $variables['items'][$delta]['attributes'] = !empty($element['#items'][$delta]->_attributes) ? new Attribute($element['#items'][$delta]->_attributes) : clone($default_attributes);
-    $delta++;
-  }
-}
-
-/**
- * Prepares variables for individual form element templates.
- *
- * Default template: field-multiple-value-form.html.twig.
- *
- * Combines multiple values into a table with drag-n-drop reordering.
- *
- * @param array $variables
- *   An associative array containing:
- *   - element: A render element representing the form element.
- */
-function template_preprocess_field_multiple_value_form(&$variables) {
-  $element = $variables['element'];
-  $variables['multiple'] = $element['#cardinality_multiple'];
-
-  if ($variables['multiple']) {
-    $table_id = Html::getUniqueId($element['#field_name'] . '_values');
-    $order_class = $element['#field_name'] . '-delta-order';
-    $header_attributes = new Attribute(array('class' => array('label')));
-    if (!empty($element['#required'])) {
-      $header_attributes['class'][] = 'js-form-required';
-      $header_attributes['class'][] = 'form-required';
-    }
-    $header = array(
-      array(
-        'data' => array(
-          '#prefix' => '<h4' . $header_attributes . '>',
-          'title' => array(
-            '#markup' => $element['#title'],
-          ),
-          '#suffix' => '</h4>',
-        ),
-        'colspan' => 2,
-        'class' => array('field-label'),
-      ),
-      t('Order', array(), array('context' => 'Sort order')),
-    );
-    $rows = array();
-
-    // Sort items according to '_weight' (needed when the form comes back after
-    // preview or failed validation).
-    $items = array();
-    $variables['button'] = array();
-    foreach (Element::children($element) as $key) {
-      if ($key === 'add_more') {
-        $variables['button'] = &$element[$key];
-      }
-      else {
-        $items[] = &$element[$key];
-      }
-    }
-    usort($items, '_field_multiple_value_form_sort_helper');
-
-    // Add the items as table rows.
-    foreach ($items as $item) {
-      $item['_weight']['#attributes']['class'] = array($order_class);
-
-      // Remove weight form element from item render array so it can be rendered
-      // in a separate table column.
-      $delta_element = $item['_weight'];
-      unset($item['_weight']);
-
-      $cells = array(
-        array('data' => '', 'class' => array('field-multiple-drag')),
-        array('data' => $item),
-        array('data' => $delta_element, 'class' => array('delta-order')),
-      );
-      $rows[] = array(
-        'data' => $cells,
-        'class' => array('draggable'),
-      );
-    }
-
-    $variables['table'] = array(
-      '#type' => 'table',
-      '#header' => $header,
-      '#rows' => $rows,
-      '#attributes' => array(
-        'id' => $table_id,
-        'class' => array('field-multiple-table'),
-      ),
-      '#tabledrag' => array(
-        array(
-          'action' => 'order',
-          'relationship' => 'sibling',
-          'group' => $order_class,
-        ),
-      ),
-    );
-
-    if (!empty($element['#description'])) {
-      $description_id = $element['#attributes']['aria-describedby'];
-      $description_attributes['id'] = $description_id;
-      $variables['description']['attributes'] = new Attribute($description_attributes);
-      $variables['description']['content'] = $element['#description'];
-
-      // Add the description's id to the table aria attributes.
-      $variables['table']['#attributes']['aria-describedby'] = $element['#attributes']['aria-describedby'];
-    }
-  }
-  else {
-    $variables['elements'] = array();
-    foreach (Element::children($element) as $key) {
-      $variables['elements'][] = $element[$key];
-    }
-  }
-}
-
-/**
- * Prepares variables for breadcrumb templates.
- *
- * Default template: breadcrumb.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - links: A list of \Drupal\Core\Link objects which should be rendered.
- */
-function template_preprocess_breadcrumb(&$variables) {
-  $variables['breadcrumb'] = array();
-  /** @var \Drupal\Core\Link $link */
-  foreach ($variables['links'] as $key => $link) {
-    $variables['breadcrumb'][$key] = array('text' => $link->getText(), 'url' => $link->getUrl()->toString());
-  }
-}
-
-/**
- * Callback for usort() within template_preprocess_field_multiple_value_form().
- *
- * Sorts using ['_weight']['#value']
- */
-function _field_multiple_value_form_sort_helper($a, $b) {
-  $a_weight = (is_array($a) && isset($a['_weight']['#value']) ? $a['_weight']['#value'] : 0);
-  $b_weight = (is_array($b) && isset($b['_weight']['#value']) ? $b['_weight']['#value'] : 0);
-  return $a_weight - $b_weight;
-}
-
-/**
- * Provides theme registration for themes across .inc files.
- */
-function drupal_common_theme() {
-  return array(
-    // From theme.inc.
-    'html' => array(
-      'render element' => 'html',
-    ),
-    'page' => array(
-      'render element' => 'page',
-    ),
-    'page_title' => array(
-      'variables' => array('title' => NULL),
-    ),
-    'region' => array(
-      'render element' => 'elements',
-    ),
-    'time' => array(
-      'variables' => array('timestamp' => NULL, 'text' => NULL, 'attributes' => array()),
-    ),
-    'datetime_form' => array(
-      'render element' => 'element',
-    ),
-    'datetime_wrapper' => array(
-      'render element' => 'element',
-    ),
-    'status_messages' => array(
-      'variables' => ['status_headings' => [], 'message_list' => NULL],
-    ),
-    'links' => array(
-      'variables' => array('links' => array(), 'attributes' => array('class' => array('links')), 'heading' => array(), 'set_active_class' => FALSE),
-    ),
-    'dropbutton_wrapper' => array(
-      'variables' => array('children' => NULL),
-    ),
-    'image' => array(
-      // HTML 4 and XHTML 1.0 always require an alt attribute. The HTML 5 draft
-      // allows the alt attribute to be omitted in some cases. Therefore,
-      // default the alt attribute to an empty string, but allow code providing
-      // variables to image.html.twig templates to pass explicit NULL for it to
-      // be omitted. Usually, neither omission nor an empty string satisfies
-      // accessibility requirements, so it is strongly encouraged for code
-      // building variables for image.html.twig templates to pass a meaningful
-      // value for the alt variable.
-      // - http://www.w3.org/TR/REC-html40/struct/objects.html#h-13.8
-      // - http://www.w3.org/TR/xhtml1/dtds.html
-      // - http://dev.w3.org/html5/spec/Overview.html#alt
-      // The title attribute is optional in all cases, so it is omitted by
-      // default.
-      'variables' => array('uri' => NULL, 'width' => NULL, 'height' => NULL, 'alt' => '', 'title' => NULL, 'attributes' => array(), 'sizes' => NULL, 'srcset' => array(), 'style_name' => NULL),
-    ),
-    'breadcrumb' => array(
-      'variables' => array('links' => array()),
-    ),
-    'table' => array(
-      'variables' => array('header' => NULL, 'rows' => NULL, 'footer' => NULL, 'attributes' => array(), 'caption' => NULL, 'colgroups' => array(), 'sticky' => FALSE, 'responsive' => TRUE, 'empty' => ''),
-    ),
-    'tablesort_indicator' => array(
-      'variables' => array('style' => NULL),
-    ),
-    'mark' => array(
-      'variables' => array('status' => MARK_NEW),
-    ),
-    'item_list' => array(
-      'variables' => array('items' => array(), 'title' => '', 'list_type' => 'ul', 'wrapper_attributes' => array(), 'attributes' => array(), 'empty' => NULL, 'context' => array()),
-    ),
-    'feed_icon' => array(
-      'variables' => array('url' => NULL, 'title' => NULL),
-    ),
-    'progress_bar' => array(
-      'variables' => array('label' => NULL, 'percent' => NULL, 'message' => NULL),
-    ),
-    'indentation' => array(
-      'variables' => array('size' => 1),
-    ),
-    // From theme.maintenance.inc.
-    'maintenance_page' => array(
-      'render element' => 'page',
-    ),
-    'install_page' => array(
-      'render element' => 'page',
-    ),
-    'maintenance_task_list' => array(
-      'variables' => array('items' => NULL, 'active' => NULL, 'variant' => NULL),
-    ),
-    'authorize_report' => array(
-      'variables' => ['messages' => [], 'attributes' => []],
-      'includes' => ['core/includes/theme.maintenance.inc'],
-      'template' => 'authorize-report',
-    ),
-    // From pager.inc.
-    'pager' => array(
-      'render element' => 'pager',
-    ),
-    // From menu.inc.
-    'menu' => array(
-      'variables' => array('menu_name' => NULL, 'items' => array(), 'attributes' => array()),
-    ),
-    'menu_local_task' => array(
-      'render element' => 'element',
-    ),
-    'menu_local_action' => array(
-      'render element' => 'element',
-    ),
-    'menu_local_tasks' => array(
-      'variables' => array('primary' => array(), 'secondary' => array()),
-    ),
-    // From form.inc.
-    'input' => array(
-      'render element' => 'element',
-    ),
-    'select' => array(
-      'render element' => 'element',
-    ),
-    'fieldset' => array(
-      'render element' => 'element',
-    ),
-    'details' => array(
-      'render element' => 'element',
-    ),
-    'radios' => array(
-      'render element' => 'element',
-    ),
-    'checkboxes' => array(
-      'render element' => 'element',
-    ),
-    'form' => array(
-      'render element' => 'element',
-    ),
-    'textarea' => array(
-      'render element' => 'element',
-    ),
-    'form_element' => array(
-      'render element' => 'element',
-    ),
-    'form_element_label' => array(
-      'render element' => 'element',
-    ),
-    'vertical_tabs' => array(
-      'render element' => 'element',
-    ),
-    'container' => array(
-      'render element' => 'element',
-    ),
-    // From field system.
-    'field' => array(
-      'render element' => 'element',
-    ),
-    'field_multiple_value_form' => array(
-      'render element' => 'element',
-    ),
-  );
-}