Issue #2390467 by iPat, adamwhite: User role permission assignments are not deleted when a role is deleted

Issue #2091321 by er.pushpinderrana, jhodgdon, rootwork, ifrik, mparker17: Update hook_help for Field and Field UI module

Issue #2392319 by alexpott, effulgentsia: Config objects (but not config entities) should by default be immutable

Issue #2281645 by dawehner, andypost: Make entity annotations use link templates instead of route names

Issue #2230637 by plach, fran seva, yched, swentel: Create a Language field widget and the related formatter

Revert "Issue #2273923 by mpdonadio, pfrenssen, dawehner, xjm, cilefen: Remove html => TRUE option from l() and link generator"

This reverts commit 0bcabf50.

Issue #2273923 by mpdonadio, pfrenssen, dawehner, xjm, cilefen: Remove html => TRUE option from l() and link generator

Issue #2358991 by JeroenT, ianthomas_uk, rpayanm, jamesdixon, er.pushpinderrana, Ashok Negi: Remove usage of drupal_mail()

Issue #2371759 by angel.angelio | cilefen: The docblock for user_help() should read "Implements hook_help().".

Issue #2368739 by Wim Leers: Fixed user_page_attachments() unnecessarily adds an individual CSS file on every page.

Issue #2350949 by Wim Leers: Add hook_page_attachments(_alter)() and deprecate hook_page_build/alter().

Issue #2340667 by YesCT, Pedro Lozano, alexpott, martin107: Protect Drupal\Core\Language\Language::id, and use getId().

Issue #2246675 by rpayanm, johnstorey, holly.ross.drupal | mgbellaire: Remove all unnecessary 'template' lines in hook_theme() declarations.

Issue #2347465 by tim.plunkett, dawehner, cilefen: Convert all instances of #type link/links to convert to use routes.

Issue #2230091 by dawehner, Berdir, marthinal, martin107: Fixed Route rebuilding is not guaranteed to finish in time for the next request.

Issue #2322233 by Temoor, Mirroar, estoyausente: Replace all instances of user_role_load(), entity_load('user_role') and entity_load_multiple('user_role') with static method calls.

Issue #2343759 by pwolanin, larowlan, dawehner, tim.plunkett, effulgentsia, xjm, Wim Leers: Provide an API function to replace url()/l() for external urls.

Issue #2340251 by iMiksu, alexpott, tim.plunkett, dawehner, Wim Leers: Remove most remaining url() calls.

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

Issue #2335659 by tim.plunkett, dawehner, effulgentsia, sun: Remove FormState ArrayAccess usage from core.

Issue #2110345 by mr.york, effulgentsia, Désiré, fgm, fago, pfrenssen, stefan.r, Berdir, Rajendar Reddy: Simplify validation constraint implementations for fields.

Issue #2318099 by tim.plunkett: Replace $form_state['complete_form'] with $form_state->getCompleteForm().

Issue #2301317 by pwolanin, dawehner, Wim Leers, effulgentsia, YesCT, xjm, alexpott: MenuLinkNG part4: Conversion.

Revert "Issue #2301317 by pwolanin, effulgentsia, Wim Leers, dawehner, alexpott: MenuLinkNG part4: Conversion."

This reverts commit fd2db9cd.

Issue #2301317 by pwolanin, effulgentsia, Wim Leers, dawehner, alexpott: MenuLinkNG part4: Conversion.