Issue #2977107 by Berdir, alexpott, jibran, larowlan: Use more specific entity.manager services in module .services.yml files
Issue #3001309 by alexpott, Krzysztof Domański: Replace usages of UrlGeneratorTrait in non-api classes
Issue #2697909 by pguillard, himanshugautam, snehi, aburrows, jhodgdon: Fix "login (noun/adjective)" vs. "log in (verb)" in comments (and logout/log out)
Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits
Issue #2228393 by almaudoh, andypost, pfrenssen, znerol, cpj, Dom.: Decouple session from cookie based user authentication
Issue #2288911 by znerol, effulgentsia: Use route name instead of system path in user maintenance mode subscriber
Issue #2294571 by znerol, effulgentsia: Redirect anonymous users to login page from an exception listener instead of in MaintenanceModeSubscriber and restrict access to the my-account link to authenticated users.
Issue #2340251 by iMiksu, alexpott, tim.plunkett, dawehner, Wim Leers: Remove most remaining url() calls.
Issue #2288665 by znerol: Remove _maintenance request attribute and replace it with a maintenance mode service.
Issue #2239009 by effulgentsia, dawehner: Remove public direct usage of the '_system_path' request attribute.
Issue #2214209 by dawehner, ParisLiakos, xjm: Move _menu_site_is_offine() into the Maintainance subscriber.