Issue #1289536 by ParisLiakos, RobLoach, Crell, larowlan, fgm, pounard, Pancho, dawehner, scor, tim.plunkett, alexpott, socketwench: Switch Watchdog to a PSR-3 logging framework.

Revert "Issue #1289536 by RobLoach, Crell, Pancho, pounard, socketwench, fgm, dawehner, scor, tim.plunkett, larowlan, ParisLiakos: Switch Watchdog to a PSR-3 logging framework."

This reverts commit ef250ba2.

Issue #1289536 by RobLoach, Crell, Pancho, pounard, socketwench, fgm, dawehner, scor, tim.plunkett, larowlan, ParisLiakos: Switch Watchdog to a PSR-3 logging framework.

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

Issue #2206909 by jhodgdon, dawehner: Regression: Form submit redirects from 403/404 pages are no longer possible.

Revert "Issue #2218039 by sun, dawehner: Render the maintenance/install page like any other HTML page."

Broke update.php.

This reverts commit 10b03890.

Issue #2188523 by sun: ExceptionController does not respect configured system.logging:error_level (verbose backtrace).

Issue #2171683 by sun, alexpott, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Revert "Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead."

This reverts commit 91db25eb. Broke web
tests.

Issue #2147153 by dawehner, alexpott, Xano: Replace the last instance of $_GET/$_POST; Create a special exception listener / exception controller which allows to use POST requests.

Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Issue #2068471 by dawehner, Crell, tim.plunkett, jibran, fubhy, larowlan: Normalize Controller/View-listener behavior with a Page object.

Issue #2119237 by cosmicdreams, Crell, damiankloip: Use \Symfony\Component\Debug\Exception\FlattenException instead of \Symfony\Component\HttpKernel\Exception\FlattenException.

Issue #2089461 by thedavidmeister, deneo, Alan D., dsdeiz, stpaultim: Convert all calls to check_plain() in core to Drupal\Component\Utility\String::checkPlain() in core/lib.

Issue #2100329 by cosmicdreams: Use \Drupal instead of Drupal to make IDEs and static code analyse tools happy.

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

Issue #2052389 by pwolanin: Fixed All elements added to the Request attributes should have a _ prepended unless they come from the path.

Issue #1890878 by corvus_ch, ygerasimov, berenddeboer, Crell, fubhy the cat, effulgentsia: Add modular authentication system, including Http Basic; deprecate global .

Issue #1269742 by katbailey, beejeebus, pwolanin, g.oechsler, ksenzee: Make path lookup code into an pluggable class.