Color module no longer requires themes to call _color_html_alter and _color_page_alter

Summary:

Color module doesn't require themes to call _color_html_alter and _color_page_alter anymore. These two functions have been removed, and themes that still use them will break.

Old code:

<?php
...
function MYTHEME_process_html(&$variables) {
  // Hook into color.module.
  if (module_exists('color')) {
    _color_html_alter($variables);
  }
}
...
function MYTHEME_process_page(&$variables) {
  $site_config = Drupal::config('system.site');
  // Hook into color.module.
  if (module_exists('color')) {
    _color_page_alter($variables);
  }
...
?>