Issue #2084339 by alexpott: Fixed The configuration value system.maintenance.enabled should be moved to the state system.

Issue #2086447 by tim.plunkett, damiankloip: Remove 'View:' prefix from views block derivative admin labels.

Issue #2078285 followup by tim.plunkett: Fixed Add short-cut methods to the \Drupal class for generating URLs and links from routes.

Issue #1203886 by catch, sun, David_Rothstein, RobLoach, tim.plunkett, greggles, alexpott, DamienMcKenna: Remove the PHP module from Drupal core

Issue #2062573 by claudiu.cristea, tim.plunkett, Xano: Change notice: Add method defaultConfiguration() in ConfigurablePluginInterface.

Revert "Issue #2062573 by claudiu.cristea, tim.plunkett, Xano: Add method defaultConfiguration() in ConfigurablePluginInterface."

This reverts commit bf37effc.

Issue #1938316 by disasm, jaskho, stella, scor, tim.plunkett, jibran | Crell: Convert book_outline() to a new-style Controller.

Issue #2062573 by claudiu.cristea, tim.plunkett, Xano: Add method defaultConfiguration() in ConfigurablePluginInterface.

Issue #2087551 by donquixote: ViewsHandlerDiscovery: Remove ->pluginNamespaces setup from constructor.

Issue #2082117 by alexpott, xjm, tim.plunkett, heyrocker, beejeebus, sun: Fixed Install default config only when the owner and provider modules are both enabled.

Revert "Issue #2082117 by alexpott: Fixed Install default config only when the owner and provider modules are both enabled."

This reverts commit 4c304cb8.

Issue #2082117 by alexpott: Fixed Install default config only when the owner and provider modules are both enabled.

Issue #1963394 by tim.plunkett, jibran, effulgentsia: Fixed ConfirmFormBase::getCancelPath() should allow for a route.

This reverts commit e18109e2.

Seems to be causing testbot failures. Rolling back for now.

Issue #2077513 by tim.plunkett, jibran, ParisLiakos, msonnabaum: Refactor ControllerBase to be more consistent with FormBase.

Issue #2068053 by tim.plunkett, larowlan: Fixed Custom block creation form redirect is inconsistent.

Issue #2083835 by yched: Fixed theme('field') displays no value on empty fields even if the formatter returned an output.

Issue #2074037 by Wim Leers, effulgentsia: Add drupalPostUrl() — drupalPost()/drupalPostAjax() are for forms only, D8 JS performs non-form HTTP requests.