Issue #2551907 by Wim Leers, dawehner: Follow-up for #2483183: make the Breadcrumb value object use composition instead of inheritance

Issue #2483183 by lauriii, martin107, Wim Leers, tim.plunkett, moshe weitzman, bfr, Fabianx, dawehner: Make breadcrumb block cacheable

Issue #2509300 by dawehner, catch, larowlan: Path alias UI allows node/1 and /node/1 as system path then fatals

Issue #2480811 by catch, dawehner, Crell, Berdir, amateescu: Cache incoming path processing and route matching

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2221699 by mpdonadio, mikey_p, alexpott, kim.pepper, arlinsandbulte: HTTP_HOST header cannot be trusted

Revert "Issue #2221699 by mpdonadio, mikey_p, kim.pepper, arlinsandbulte: HTTP_HOST header cannot be trusted"

This reverts commit 2c9eddf3.

Issue #2221699 by mpdonadio, mikey_p, kim.pepper, arlinsandbulte: HTTP_HOST header cannot be trusted

Issue #2281619 by dawehner, tim.plunkett: Convert most direct usages within module code of routing related request attributes to use RouteMatchInterface instead

Issue #2331079 by znerol, dawehner: Use RouteMatch in access-checks and remove RequestHelper::duplicate().

Issue #2322809 by chx, dawehner, tim.plunkett: Tighten routing security by access checking in matchRequest.

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

Issue #2292025 by tim.plunkett: Convert BreadcrumbBuilderInterface applies() and build() to use RouteMatch.

Issue #2267763 by pwolanin, tim.plunkett: Page titles with %placeholders are broken when used as breadcrumbs.

Issue #2236207 by znerol: Use router request context instead of request service in system breadcrumb builder.

Issue #2180425 by dawehner, klausi: PathBasedBreadcrumbBuilder should catch all exceptions from routing.

Issue #2185831 by tim.plunkett: Split up ParamConverterManager and stop throwing NotFoundHttpException.

Issue #2066535 by tim.plunkett, jsst, Berdir: Add EntityManagerInterface and stop typehinting with EntityManager.

Issue #2048223 by dawehner, ParisLiakos, herom, fubhy, damiankloip, vijaycs85, joelpittet, tim.plunkett: Add $account argument to AccessCheckInterface::access() method and use the current_user() service.

Issue #2099095 by jibran, tim.plunkett: Create BreadcrumbBuilderBase and remove the boilerplate code from BreadcrumbBuilders.

Issue #2070651 by pwolanin, dawehner, larowlan, tim.plunkett, ParisLiakos: Introduce a path-based breadcrumb builder, remove the one that's based on {menu_links()}.