Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2537732 by Xano, tim.plunkett, gnuget, claudiu.cristea, drunken monkey, bojanz: PluginFormInterface must have access to the complete $form_state (introduce SubFormState for embedded forms)

Issue #2633160 by nicholasThompson, tim.plunkett: Do not fail for missing context if a condition is negated

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2614604 by rakesh.gectcr, dawehner: PHPdoc is missing for an overridden function in class ConditionManager

(cherry picked from commit b33ed035)

Issue #2502621 by Pravin Ajaaz, hussainweb, Peacog, jhodgdon, ivanjaros: Replace implement notes with inheritdoc tag

Issue #2375695 by Berdir, EclipseGc, tim.plunkett, Wim Leers, Fabianx, dawehner: Condition plugins should provide cache contexts AND cacheability metadata needs to be exposed

Issue #2422815 by Xano, fgm, tim.plunkett, dawehner: Don't initialize the discovery object in plugin managers, unless needed

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2349991 by fago, Xano, amateescu: Provide a trait for categorizing plugin managers and use it for conditions and actions

Revert "Issue #2196977 by Eric_A, tadityar, Poornima3, jhedstrom: Drupal/filter/Annotation/Filter uses public $module instead of $provider"

Oops. Forgot we're in majors/criticals only mode today.

This reverts commit 1621ae8b.

Issue #2196977 by Eric_A, tadityar, Poornima3, jhedstrom: Drupal/filter/Annotation/Filter uses public $module instead of $provider

Issue #2339151 by EclipseGc, tim.plunkett, Gábor Hojtsy, effulgentsia: Conditions / context system does not allow for multiple configurable contexts, eg. language types

Issue #2246647 by mpdonadio, cilefen, YesCT, tim.plunkett: Rename PluginBag to LazyPluginCollection.

Issue #1182850 by xjm, Stefan Lehmann, jmcintyre, Bojhan: Remove full stops at the end of checkbox options.

Issue #2318281 by tim.plunkett, dawehner | kim.pepper: Provide a standard way to check a plugin is an instance of the required interface.

Issue #2305569 by fago: Fixed Follow-up to context definitions: Remove unused, left-over static contextDefinitions() methods.

Issue #2281635 by fubhy, er.pushpinderrana, EclipseGc, blueminds, tim.plunkett: \Drupal\Core\Plugin\Context\Context should use a ContextDefinition class instead of arrays.

Issue #2278541 by tim.plunkett, kim.pepper, Bojhan, EclipseGc: Refactor block visibility to use condition plugins.

Issue #2283929 by tim.plunkett: Clean up condition plugins to have schema support and to allow them to be optional.

Issue #2277981 by tim.plunkett, EclipseGc, fago: Provide a service for handling context-aware plugins.

Issue #2053153 by tim.plunkett, dawehner, damiankloip, aspilicious: Allow contrib modules to provide plugins on behalf of optional modules.