Issue #2451395 by dawehner: drupal_get_schema()/drupal_get_complete_schema() no longer work as expected; remove them

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

Issue #2229145 by znerol, neclimdul, larowlan, alexpott, joelpittet, almaudoh, tadityar: Register symfony session components in the DIC and inject the session service into the request object

Revert "Issue #2229145 by znerol, neclimdul, larowlan, joelpittet, almaudoh: Register symfony session components in the DIC and inject the session service into the request object"

This reverts commit b926f5d8.

Issue #2229145 by znerol, neclimdul, larowlan, joelpittet, almaudoh: Register symfony session components in the DIC and inject the session service into the request object

Issue #2381763 by chx, webflo: Adjust the order of container yamls to override settings per environment

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 #2406543 by alexpott: Remove ConfigFactory::setOverrideState and ConfigFactory::getOverrideState()

Issue #2392319 by alexpott, effulgentsia: Config objects (but not config entities) should by default be immutable

Revert "Issue #2382239 by chx: InstallerKernel is undocumented and hardwires bootstrap config storage"

This reverts commit 6389cda9.

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

Issue #2328111 by dawehner, martin107, neclimdul: Replace most instances of the DRUPAL_ROOT constant with the app.root container parameter.

Issue #2294313 by Ieva Uzule, rachel_norfolk, nathanlawson91, xadag, er.pushpinderrana, Dominique CLAUSE, marcus7777: Email is asked before user name in SiteConfigureForm.

Issue #2335659 by tim.plunkett, dawehner, effulgentsia, sun: Remove FormState ArrayAccess usage from core.

Issue #1974048 by Gábor Hojtsy, vijaycs85, er.pushpinderrana, Sutharsan, penyaskito, bserem: Fixed Limited display of languages when going back in installer is confusing.

Issue #2309323 by Berdir, tim.plunkett: Allow #submit and #validate to be specified as methods of the form object.

Issue #2251113 by alexpott, damiankloip, Crell, Wim Leers, dawehner, sun: Use container parameters instead of settings.

Issue #2308821 by tim.plunkett: Replace FormErrorInterface with $form_state->setErrorByName() and $form_state->setError().

Issue #2284103 by alexpott, fabpot, damiankloip, Xano, Xen, Berdir: Fixed Remove the request from the container.

Issue #2016629 by larowlan, neclimdul, sun, alexpott, jibran, ParisLiakos, donquixote, effulgentsia, msonnabaum: Refactor bootstrap to better utilize the kernel.

Issue #950534 by mparker17, mgifford, Mixologic, jbloomfield, erinclerico, theMusician, wmostrey | zirvap: [policy] Consistently use email instead of e-mail in Drupal.

Issue #1963760 by amitgoyal, fnuppy | valthebald: Fixed Make sure install.php gives accurate information if Drupal is already installed.

Issue #2268975 by Gábor Hojtsy, vijaycs85: Fixed named schema elements missing when installing Drupal.

Issue #2260321 by sun: Use Testing profile instead of Minimal profile in interactive installer tests by default.

Issue #2191785 by sun: Password managers are identifying/storing wrong username field when creating a user account.

Issue #2079797 by ParisLiakos, Xano, amateescu, tim.plunkett: Provide a trait for $this->t() and $this->formatPlural().

Issue #2227355 by sun: InstallerServiceProvider does not override all cache bins to use memory backend.