Issue #2301239 by pwolanin, dawehner, Wim Leers, effulgentsia, joelpittet, larowlan, xjm, YesCT, kgoel, victoru, berdir, likin, and plach: MenuLinkNG part1 (no UI or conversions): plugins (static + MenuLinkContent) + MenuLinkManager + MenuTreeStorage.
Issue #2289063 by larowlan, andypost | Berdir: Change contact message entity to behave more like a normal entity.
Issue #2296839 by MKorostoff, er.pushpinderrana | YesCT: Remove deprecated comment_num_new().
Issue #2302525 by tim.plunkett: Convert file_module_test_form to a class.
Issue #2302331 by kim.pepper: Move drupal_valid_path to PathValidator service.
Issue #1998198 by pwolanin, splatio, Albert Volkman, tim.plunkett, andypost, disasm, Les Lim, tkuldeep17: Convert user_pass_reset to a new-style Form object.
Issue #2078015 by er.pushpinderrana, RoSk0 | alexanansi: Modernize views_test_data.module forms.
Issue #2086499 by phiit, tim.plunkett | Gábor Hojtsy: Convert two page callbacks in language_elements_test.module to the new controller system.
Issue #2300829 by Jose Reyero: Fixed Clean up LocaleConfigManager / TypedConfigManager features and cache duplications.
Issue #2298665 by nod_: Fixed Remove dead code in form.js.
Issue #2302463 by effulgentsia: Cleanup User::hasPermission() and UserSession::hasPermission() to follow Law of Demeter.
Issue #2033211 by LewisNyman, tim.plunkett, JamesLefrère | yannickoo: Move Seven CSS files into css directory.
Issue #2202511 by hussainweb, benjy | mikeryan: Added Implement migration groups.
Issue #2291439 by Wim Leers, tstoeckler: Fixed CKEditor's "readonly" needs to be per-instance but is applied per-format, across instances.
Issue #2302531 by tim.plunkett: Convert database_test_theme_tablesort to a class.
Issue #2132477 by tkuldeep17, tim.plunkett | shameemkm: Convert batch_test forms to controllers.
Issue #1978926 by likin, YesCT, Pancho, kim.pepper, h3rj4n, tim.plunkett, disasm, Luxian, neetu morwani | vijaycs85: Convert locale_translation_status_form to a Controller.
Issue #2178651 by ianthomas_uk: Fixed Consider UX implications of indexed vs non-indexed search pages.
Issue #2279213 by neclimdul, sun | donquixote: Fixed KernelTestBase::unregisterStreamWrapper() is called once with insufficient arguments.
Issue #2291137 by cilefen | webchick: Rename various *links.yml files to improve DX.