Issue #2024833 followup by claudiu.cristea: Adopt load() and loadMultiple() on entity storage controllers.

Issue #1988780 by pfrenssen: Fixed DrupalWebTestCase::buildXPathQuery() tries to handle backreferences in argument values.

Issue #2028939 by cilefen, deekayen: Clean up line wrapping in simpletest documentation and make namespaces in docs fully qualified

Issue #1924430 by echoz, JohnAlbin, izus, kim.pepper, LewisNyman: Add drupal.base library for base CSS styles.

Issue #2016691 by damiankloip, LinL: Convert Drupal\serialization\Tests\SerializationTest to DrupalUnitTestBase.

Issue #2009670 by esunger, jeroen12345, hussainweb: Replace theme() with drupal_render() in simpletest module.

Issue #1978938 by sidharthap, disasm, laurentchardin, pguillard, dawehner, somepal: Convert overlay_user_dismiss_message() to a Controller.

Issue #2035087 by lazysoundsystem, Crell, Cottser: Remove remaining t() from test assert messages in views and views_ui

Issue #1978952 by vijaycs85, vyasamit2007, tim.plunkett: Convert shortcut_set_add() to a Controller.

Issue #2030457 by Mark Carver, Cottser: Fixed Warning: Missing argument 3 for template_preprocess() for theme functions overridden by templates.

Issue #849624 by brad.bulger, Stevel, oriol_e9g, Alan Evans: Fixed wrong permission for admin/structure/menu/parents.

Issue #1987262 by the_phi, clemens.tolboom, Damien Tournoud, bshaffer, catch, alexpott, bvanmeurs: Fixed [Installation Error] Symfony: 'The service definition 'request' does not exist.'

Issue #1868004 by fago, das-peter, Berdir, EclipseGc, fubhy the cat, dixon_: Improve the TypedData API usage of EntityNG.

Issue #1971158 by Berdir, beejeebus, alexpott, amateescu: Add loadMultiple() and listAll() caching to (cached) config storage.