This reverts commit e18109e2.

Seems to be causing testbot failures. Rolling back for now.

Issue #2077513 by tim.plunkett, jibran, ParisLiakos, msonnabaum: Refactor ControllerBase to be more consistent with FormBase.

Issue #2068053 by tim.plunkett, larowlan: Fixed Custom block creation form redirect is inconsistent.

Issue #2083835 by yched: Fixed theme('field') displays no value on empty fields even if the formatter returned an output.

Issue #2074037 by Wim Leers, effulgentsia: Add drupalPostUrl() — drupalPost()/drupalPostAjax() are for forms only, D8 JS performs non-form HTTP requests.

Issue #2027181 by Wim Leers, seutje, Bojhan: Use a CKEditor Widget to create a stellar UX for captioning and aligning images.

Issue #2053519 by alexpott:  Broken PHPUnit test with E_STRICT enabled for AJAX fails on View with 'AJAX: Yes'.

Issue #1991684 by Wim Leers, rcaracaus, amateescu, msonnabaum: Fixed Node history markers (comment & node 'new' indicator, 'x new comments' links) forces render caching to be per user.

Issue #1978916 by likin, YesCT, disasm, ayelet_Cr, tim.plunkett, vijaycs85, Letharion: Convert locale_translate_page() to a Controller.

Issue #2071019 by tim.plunkett, olli: Allow the block category for Views block displays to be edited.

Issue #2074509 by tim.plunkett, falcon03, mgifford, Xano: Fixed Add missing #title property to ensure form accessibility.

Issue #2070609 by damiankloip, tstoeckler: Remove obsolete 'module' keys from Views plugin annotations.

Issue #2066523 by mparker17, disasm: Convert common_test_drupal_render_invalid_keys() to a new style controller.

Issue #2061331 by yched, plopesc: Added helper methods getEntity() in FieldInterface / FieldItemInterface.

Issue #2003570 by aparnakondala123, vineet.osscube, tstoeckler: Fixed Enabling RTL and then changing theme colors moves the hexadecimal # to the right.

Issue #1971158 by Berdir, beejeebus, alexpott, amateescu: Follow-up: Add loadMultiple() and listAll() caching to (cached) config storage.

Issue #2078855 by dawehner, pwolanin: Fixed Request::create() is slow, use a helper to duplicate instead.

Issue #2061973 by InternetDevels, naveenvalecha: Replace user_access() calls with $account->hasPermission() in book module.

Issue #1978958 by jibran, disasm, kgoel, Pancho, vijaycs85, cosmicdreams, dawehner, wamilton: Convert comment_reply() to a Controller.

Issue #2083941 by dawehner: Fixed \Drupal\Core\Theme\Attribute->value() is named wrong and does not work.

Issue #2084711 by alexpott: Add beejeebus to MAINTAINERS.txt for Configuration system and Config entities.

Issue #2082509 by Gábor Hojtsy, twistor: Generalize node changed constraint to entity changed constraint.