Issue #2563801 by rashid_786, sdstyles, keopx, joshi.rohit100, Mile23, lachezar.valchev, NikhilValand: Remove usage of menu_test_theme_page_callback()

Issue #2511516 by lauriii, Xano, Wim Leers, dawehner: Make local tasks and actions hooks provide cacheability metadata, to make the blocks showing them cacheable

Issue #2463659 by andypost, Wim Leers, rpayanm, Fabianx, googletorp: Regression test coverage: integration test for an uncacheable menu link that depends on session data

Issue #507488 by lauriii, mdrummond, Wim Leers, Manuel Garcia, pwolanin, davidhernandez, chx, jibran, andypost, dawehner, Xano, tuutti, Gábor Hojtsy, LewisNyman, maximiliam, eiriksm, borisson_, bill richardson, Fabianx, joelpittet, Jeff Burnz, xjm, webchick, Bojhan, EclipseGc, emma.maria, tim.plunkett: Convert page elements (local tasks, actions) into blocks

Issue #2547851 by alexpott, joelpittet, dawehner, stefan.r, xjm: SafeMarkup::format() should require arguments without them it is just SafeMarkup::set() in disguise

Issue #2541800 by jhodgdon, Gábor Hojtsy: Some config do not inherit from config_object, so locale_system_set_config_langcodes() results in schema errors

Issue #2532476 by dawehner, pwolanin, pfrenssen, Gábor Hojtsy, effulgentsia: Menu links should use a TranslationWrapper to encapsulate safe translatable strings from YAML files

Issue #2338081 by pwolanin, dawehner, effulgentsia, kgoel, vijaycs85, mpdonadio, chx, brandon.holtsclaw, alexpott, Gábor Hojtsy, Fabianx, catch, YesCT, JvE: Local Tasks, Actions, and Contextual links mark strings from derivatives (or alter hooks) as safe and translated

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2349711 by lauriii, mortendk, sqndr, akalata, yannickoo, Manjit.Singh, Jolidog, b0unty, aliyakhan, LewisNyman: Remove all visual from stark

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2363139 by Wim Leers, dawehner, larowlan: _content controllers may only return render arrays, not strings.

Issue #2264041 by pwolanin, dawehner, cilefen, chx: Fixed Add a test to ensure title callbacks are not vulnerable to XSS.

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 #2216535 by jhodgdon, Berdir: Replace Node overview topic and Node API topic with Entity Hooks topic.

Issue #2288665 by znerol: Remove _maintenance request attribute and replace it with a maintenance mode service.

Issue #1875996 by Xano, tim.plunkett, neclimdul, Rajendar Reddy, Jalandhar: Reconsider naming conventions for derivative classes.

Issue #2238217 by effulgentsia, neclimdul, martin107, tim.plunkett, cweagans, kim.pepper, xjm: Introduce a RouteMatch class.

Issue #2214209 by dawehner, ParisLiakos, xjm: Move _menu_site_is_offine() into the Maintainance subscriber.

Issue #2224887 by alexpott, Berdir, Gábor Hojtsy, Jalandhar: Language configuration overrides should have their own storage.

Issue #2258299 by juampy: Dblog_menu_link_defaults_alter() must set 'machine_name' to avoid duplicates.

Issue #2233787 by alexpott, xjm | tim.plunkett: Move default configuration into extension/config/install to clarify its purpose.

This reverts commit 07f63fe6.

Issue #2187477 by lokapujya, vaibhavjain, visabhishek: Remove Unused use statements from system module.

Issue #2226903 by pwolanin, dawehner, tvn, martin107, jessebeach: Step 1: Move static menu links to yml files.