Issue #2087551 by donquixote: ViewsHandlerDiscovery: Remove ->pluginNamespaces setup from constructor.

Issue #2082117 by alexpott, xjm, tim.plunkett, heyrocker, beejeebus, sun: Fixed Install default config only when the owner and provider modules are both enabled.

Revert "Issue #2082117 by alexpott: Fixed Install default config only when the owner and provider modules are both enabled."

This reverts commit 4c304cb8.

Issue #2082117 by alexpott: Fixed Install default config only when the owner and provider modules are both enabled.

Issue #1963394 by tim.plunkett, jibran, effulgentsia: Fixed ConfirmFormBase::getCancelPath() should allow for a route.

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.