Issue #1975220 by davidwbarratt, tstoeckler, mradcliffe, RobLoach, Mile23, hussainweb: Allow a Composer user to manage Drupal, modules, and PHP dependencies with a custom root composer.json

Issue #2398847 by kattekrab: Remove reference to Breakpoint_UI module from Breakpoint module help text

Revert "Issue #2403793 by larowlan: EntityReferenceItem uses a static, but it was most likely supposed to be a constant"

This reverts commit 4243b609.

Issue #2403793 by larowlan: EntityReferenceItem uses a static, but it was most likely supposed to be a constant

Issue #2358981 by tadityar, tstoeckler, larowlan, mpdonadio, Devin Carlson: Provide a mechanism for dynamic library declarations

Issue #853800 by emma.maria, kattekrab, Jeff Burnz, eigentor, couturier, cafuego, dcrocks: Float image left in Bartik Articles

Issue #2392263 by Gábor Hojtsy: Sequence subtyping cannot override item type in config schema, views taxonomy term filter schema incorrect

Issue #2401253 by idebr: settings.php says it contains Twig debug settings while these are actually in services.yml

Issue #2370183 by Mile23, DuaelFr: Expand unit testing for Drupal\Component\Plugin\Discovery\DiscoveryTrait

Issue #2396739 by hussainweb, Mile23: Clean-up config_translation module test members - ensure property definition and use of camelCase naming convention

Issue #2396657 by Mile23: Clean-up history module test members - ensure property definition and use of camelCase naming convention

Issue #2396707 by hussainweb: Clean-up path module test members - ensure property definition and use of camelCase naming convention

Issue #2380773 by tibbsa, hussainweb, Mile23: Clean-up Node module test members - ensure property definition and use of camelCase naming convention

Issue #2381753 by tadityar, tibbsa, Mile23, cilefen: Clean-up Config module test members - ensure property definition and use of camelCase naming convention

Issue #2396691 by hussainweb: Clean-up language module test members - ensure property definition and use of camelCase naming convention

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

Issue #2396709 by hussainweb: Clean-up quickedit module test members - ensure property definition and use of camelCase naming convention

Issue #2396701 by hussainweb: Clean-up options module test members - ensure property definition and use of camelCase naming convention

Issue #2396695 by hussainweb: Clean-up link module test members - ensure property definition and use of camelCase naming convention

Issue #2379419 by Mile23, DuaelFr: Expand unit testing for Drupal\Component\Plugin\Discovery\StaticDiscoveryDecorator

Issue #2371531 by Mile23, YesCT, daffie: Expand unit testing for Drupal\Component\Plugin\PluginManagerBase