Issue #2176397 by carsato, InternetDevels: Drupal\Core\Template\TwigTemplate::getContextReference is final.

Issue #1939132 by lauriii, Albert Volkman, trawekp, David_Rothstein: Password reset token is never deleted from the user's session after the password is changed.

Issue #2047633 by dawehner, pwolanin, Xano, amateescu, tim.plunkett: Move definition of menu links to hook_menu_link_defaults(), decouple key name from path, and make 'parent' explicit.

Issue #2175765 by alexpott, Gábor Hojtsy: Fix comment in system_theme_default() to not refer to obsolete function

Issue #1979468 by Wim Leers, nod_, pwolanin, longwave, thedavidmeister, jessebeach, larowlan | catch: .active from linkGenerator(), l() and theme_links() forces an upper limit of per-page caching for all content containing links.

Issue #2136507 by Wim Leers: Use client-side cache tags & caching to eliminate 1 HTTP requests/page for rendering Contextual Links.

Issue #2175017 by tim.plunkett, yched: FieldDefinition::create() doesn't populate default 'settings' for the field type.

Issue #2168333 by tim.plunkett, EclipseGc, yched, fago: Ensure custom EntityType controllers can be provided by modules.

Issue #2102489 by webwarrior, InternetDevels: Remove drupal_set_title in views module controllers (last instance of drupal_set_title()).

Somehow this broke PHPUnit, so rolling back for now.

This reverts commit 91b465bd.