Issue #2022207 by pcambra, Berdir: Make references to User class in test docs reference UserInterface instead

Issue #2013094 by pwieck, Cottser: Remove unnecessary template_preprocess() reference from all Twig files

Issue #1777956 by fago, klausi, sun, dasjo: Provide a way to define default values for entity fields.

Issue #1981306 by aspilicious, andypost, pcambra, swentel, amateescu: Drop procedural usage of fields in [a-e] modules.

Issue #1982980 by ParisLiakos, larowlan, dawehner, tim.plunkett: Move entity_get_form() to Drupal\Core\Entity\EntityManager::getForm().

Issue #1363112 by mparker17, mgifford, tlattimore, Jacine, dcmouyard, bowersox, ry5n, ahdiaz: Simplify names of 'element-x' helper classes.

Issue #1998582 by damiankloip, brantwynn, dawehner: Auto-generate machine_name() for Views Blocks using [viewname]_[displayname] rather than forcing manual entry.

Issue #1903346 by Berdir, tim.plunkett, EclipseGc: Establish a new DefaultPluginManager to encapsulate best practices.

Issue #1978166 by larowlan, smiletrl, tim.plunkett, effulgentsia: Convert block/add/{%custom_block_type()} to Controller.

Issue #2008356 by dawehner, tim.plunkett: Provide a _entity_list() route default to replace Controller\EntityListController and mimic _entity_form().

Issue #1893772 by chx, fubhy, slashrsm: Move entity-type specific storage logic into entity classes.

Issue #1986802 by yched: Rename PluginInspectionInterface::getDefinition() to getPluginDefinition().

Issue #1972514 by Wim Leers, effulgentsia, Gábor Hojtsy, ekl1773: Fixed Impossible to set attributes for all entities.

Issue #1998140 by dawehner, ParisLiakos, tim.plunkett: Remove backward compatible ControllerInterface.

Issue #1825332 by Berdir, ParisLiakos, andypost, dawehner, jrglasgow, aspilicious: Introduce an AccountInterface to represent the current user.

Issue #1898038 by jenlampton, joelpittet, duellj, Cottser, Shawn DeArmond, widukind, ezeedub, c4rl: Custom_block().module - Convert theme_ functions to Twig.

Issue #1998576 by beejeebus, alexpott, swentel: Make the config import process use full config trees again.

Issue #1938898 followup by brantwynn, tim.plunkett, Cottser: Fixed Convert block theme tables to table #type.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.

Issue #1818570 by Berdir, effulgentsia, das-peter, andypost: Convert users to the new Entity Field API.

Issue #1969662 by swentel, amateescu, chx | yched: Provide new _update_8000_*() CRUD helpers for Field and Instance definitions.

Issue #1879774 by damiankloip, dawehner, effulgentsia: catch plugin exceptions for invalid views display plugins.

Issue #2006636 by tim.plunkett: Fixed menu_contextual_links() will always return a link to the MENU_DEFAULT_LOCAL_TASK, never the parent.

This reverts commit c4e52bb6.

Issue #1980338 by vineet.osscube, nick_schuch: Fixed Fatal error: Class 'plugin.manager.block' not found in /core/modules/system/system.module on line 1162.