Issue #2389455 by hussainweb, AjitS, Mile23, subhojit777, tibbsa, Ayesh: Clean-up system module test members - ensure property definition and use of camelCase naming convention

Issue #2461087 by Wim Leers, dawehner: Add 'no_cache' route option to mark a route's responses as uncacheable (was: Cron run response should not be cacheable)

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

Issue #2451665 by dawehner: Don't rebuild the route on ModuleInstaller::install() (30% installer speedup)

Issue #2458289 by Wim Leers: CronRunTest::testAutomaticCron() should test with an authenticated user

Issue #2451085 by dawehner, Arla: _drupal_log_error() passes NULL to ThemeManager::setActiveTheme(), violating its typehint

Issue #2429671 by Berdir, Wim Leers: "The website has encountered an error. Please try again later." page is cached

Issue #2453351 by effulgentsia, Wim Leers: Maintenance mode message ends up in page cache, served endlessly

Issue #356399 by dawehner, beejeebus, catch, sidharrell, klausi, nlisgo, Josh Waihi, Berdir, martin107: Optimize the route rebuilding process to rebuild on write

Issue #2417075 by tstoeckler, David4514, dawehner, sachbearbeiter, mpdonadio: Trusted host verification is incompatible with URIs with the "internal" scheme

Issue #1728804 by Berdir: Introduce (Content)EntityDeleteForm and children to handle entity deletions

Issue #2364157 by mpdonadio, dawehner, martin107, Berdir, pcambra, naveenvalecha, tim.plunkett: Replace most existing _url calls with Url objects

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

Issue #2142653 by corbacho, sqndr, LewisNyman, floretan, BarisW, G-raph, JamesLefrère, lokapujya, LoMo, Outi: Change default logo filetype to .svg and add an SVG version of Druplicon

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 #2382195 by tibbsa, subhojit777, tadityar, cilefen, Mile23: Clean-up simpletest module test members - ensure property definition and use of camelCase naming convention

Issue #2395395 by alexpott, effulgentsia, Gábor Hojtsy: TestBase lacks a config method to be used consistently in tests

Issue #2183983 by Gábor Hojtsy, vijaycs85, Berdir, Wim Leers, webflo, alexpott: Find hidden configuration schema issues

Issue #2364381 by Wim Leers: Exception thrown in drupal_render() causes an exception during the rendering of exceptions

Issue #2347999 by Mile23, daffie, cs_shadow, cosmicdreams: DrupalUnitTestBase is deprecated, replace with KernelTestBase

Issue #2350823 by lauriii, jhedstrom, Tim Bozeman, cilefen, davidhernandez, inqui, Cottser, xjm: Use the Classy theme in the Testing profile

Issue #2324055 by dawehner, cilefen, znerol: Split up the module manager into runtime information and extension information

Issue #2288911 by znerol, effulgentsia: Use route name instead of system path in user maintenance mode subscriber