Issue #1910606 by vijaycs85, mavimo, dawehner, sandipmkhairnar: Improve the configurations schemas for Views significantly.

Issue #2003270 by markie, Dan Reinders, jibran: Rename Views method set_where_group() to setWhereGroup().

Issue #2002920 by sillygwailo, Psikik, jibran, Maxis: Rename Views method get_items_per_page() to getItemsPerPage().

Issue #2011998 by David_Rothstein: String-parsing in hook_custom_theme() should be replaced with theme callbacks (for now).

Issue #2004224 by Berdir, andypost: Convert tests using TestEntity to EntityTest (except Field API tests).

Issue #1987408 by chrisjlee, jstoller, gnuget, Cottser: Overlay.module - Convert theme_ functions to Twig.

Issue #2002190 by dawehner, jhedstrom: Convert core/modules/search/lib/Drupal/search/Tests/SearchExpressionTest.php to phpunit.

Issue #1813762 by ParisLiakos, Jose Reyero, YesCT, japicoder, attiks: Introduce unified interfaces, use dependency injection for interface translation.

Issue #2000558 by pwolanin, nod_, dawehner: Regrression: Progress bar creates doesn't stop on errors.

Issue #1898052 by jenlampton, taslett, Cottser, Pierre Paul Lefebvre, c4rl, joelpittet: Convert color module to Twig.

Issue #2003596 by ebeyrent, DmitryDrozdik: Replace drupal_container() with Drupal::service() in the contact module.

Issue #2003630 by ebeyrent, alexander.ilivanov: Replace drupal_container() with Drupal::service() in the entity_reference() module.