Issue #2309889 by tim.plunkett, dawehner: Fixed DrupalKernel requires a Drupal\Core\*\Plugin directory for annotated classes to be discovered.

Issue #2337927 by effulgentsia, plach, fago: Fixed SqlContentEntityStorage::onFieldStorageDefinition(Create|Update|Delete)() is broken for base fields.

Issue #2329847 by tuutti, rachel_norfolk, Cottser | davidhernandez: Use Attribute to replace hard coded classes in language-negotiation-configure-form.html.twig.

Issue #2325571 by asif_khan, omers | dawehner: Replace _theme() calls by calls to \Drupal::theme()->render().

Issue #2334785 by znerol: Remove _maintenance request attribute from SpecialAttributesRouteSubscriber.

Issue #2303525 by paulmckibben, tim.plunkett: Provide link tags to alternate languages (hreflang) in HTML head.

Issue #2337227 by er.pushpinderrana, larowlan: Fixed NodeAccessControlHandler performs non-strict in_array check.

Issue #1976298 by larowlan: Move taxonomy_get_tree() and associated functions to Taxonomy storage, deprecate procedural wrappers.

Issue #2321609 by benjy, dawehner: Fixed Provide a helpful message in case requirements are not met.

Issue #2337847 by alexpott, YesCT, martin107: The negotiated method_id does not need to be sorted on the Language or ConfigurableLanguage object.

Issue #2328411 by dawehner, geerlingguy, herom: Convert all permissions to yml files and permission callbacks.

Issue #2337859 by martin107 | YesCT: LanguageUrlRewritingTest should not be setting the id of a language.

Issue #2331079 by znerol, dawehner: Use RouteMatch in access-checks and remove RequestHelper::duplicate().

Issue #2313757 by Berdir, Wim Leers, dawehner: Remove text_processing option from text fields, expose existing string field types as plain text in UI.

Issue #2339665 by larowlan: Fixed EntityForm::submitForm docblock refers to non-existent CommentFormController.

Issue #2319177 by swentel, fago: Fixed Cron lock time limit is too short and does not prevent multiple, concurrent cron runs.

Issue #2337911 by martin107: LanguageUrlRewritingTest checkUrl $language parameter definition is incorrect.

Issue #2339135 by tim.plunkett: Fixed EntityViewsDataTest is located in the wrong directory/namespace.

Issue #2337709 by tim.plunkett: Convert form_state_values_clean() to FormStateInterface::cleanValues().

Issue #2303361 by tim.plunkett, kim.pepper: Replace instances of deprecated drupal_valid_path with PathValidator.