Fix diverse coding standard errors and warnings.
Issue #2655118 by jdanthinne, benjamin vasseur, moreorless, pizzabrarian: User error: "attributes" is an invalid render array key in Drupal\Core\Render\Element::children()
Issue #2841484 by mortona2k: Warning: array_filter() expects parameter 1 to be array
Remove entityTypeManager initialization in CustomSearchBlock constructor.
Issue #2856623 by rocket.man: Replace all deprecated uses
Remove var_dump in custom_search.module.
User error: attributes is an invalid render array key in Drupal\Core\Render\Element::children()
Issue 2694745: Replace taxonomy_get_tree with taxonomy\TermStorage->loadTree.
Remove empty line at file ending in templates/custom_search-results.html.twig.
Minor code style fix.
Add missing use directive to post_update hooks.
Issue #2841727 by mortona2k: Undefined index: types-fieldset, lang-fieldset
Issue #2854534 by webcultist: Undefined Index in "custom_search_preprocess_item_list__search_results"
Add block settings schema for making block settings translatable.
[#2839175] by Umed_singh: Typo in README
[#2807307] by blink38: Use TrustedRedirectResponse in form response
[#2797669] by Pradnya Pingat: Replace usage of t() in plugins with $this->t() to make it testable
Issue #2758417 by rajeshwari10: Removed deprecated usage of SafeMarkup::checkPlain from the codebase
Issue #2758275 by Vinay15, sandipshirsale: Remove @file tag docblock from all the .php files
[#2757083] by ben.kyriakou: Double-check if advanced search is enabled
[#2727737] fixed: update translation strings placeholders
[#2689869] fixed by heykarthikwithu: Unused imports in code base
[#2683123] by Neelanjana Das: JS Linting
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