Issue #2315255 by Dave Reid: Fixed Xss::split() fails on custom HTML elements with dashes in the name.

Issue #2313397 by tim.plunkett: Replace FormBuilderInterface::setValue() with FormStateInterface::setValueForElement().

Issue #2308821 by tim.plunkett: Replace FormErrorInterface with $form_state->setErrorByName() and $form_state->setError().

Issue #2289999 by dawehner, Cottser | Fabianx: Add an easy way to create HTML on the fly without having to create a theme function / template.

Issue #2265939 by tim.plunkett, dawehner, effulgentsia: Fixed [sechole] AccessManager::checkNamedRoute() leaks attributes from current request.

Issue #2272481 by herom, ParisLiakos, tim.plunkett: Remove usages of watchdog() from forms, plugins and controllers.

Issue #2162005 by plopesc: Clean up entity_reference default values once users 0 and 1 provides UUID.

Issue #2263365 by donquixote, longwave, alexpott: Second loop in module_implements() being repeated for no reason.

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.

Issue #2310705 by lokeoke, tim.plunkett, dawehner: AccessManager should introduce constants for 'ANY' / 'ALL'.

Issue #2304651 by YesCT, martin107: Fixed Core Language sort() should not work, needs to use name instead of default title.

Issue #2073811 by dawehner, pwolanin, joelpittet, Cottser, Mark Carver, steveoliver: Add a url generator twig extension.

Issue #2306455 by hussainweb, alexpott, er.pushpinderrana: Fixed ConfigEntityStorage adds too many dots.

Issue #2302617 by dawehner, chx | Crell: Define a standard mechaism for backend-aware service overrides.

Issue #2279395 by alexpott, mradcliffe, plach, bzrudi71: Fixed The PostgreSQL backend does not handle NULL values for serial fields gracefully.

Issue #2279395 by alexpott, mradcliffe, bzrudi71: Fixed The PostgreSQL backend does not handle NULL values for serial fields gracefully.

Issue #2293773 by Gábor Hojtsy, alexpott, effulgentsia, penyaskito, hussainweb: Fixed Field allowed values use dots in key names - not allowed in config.

Issue #2301313 by pwolanin, dawehner, Wim Leers, effulgentsia, kgoel, YesCT, glide: MenuLinkNG part3 (no conversions): MenuLinkContent UI.

Issue #2146035 by olli, mondrake: Fixed drupalSettings.path.pathPrefix does not contain the language identifier.