Issue #1852454 by patrickd, xjm, YesCT, Berdir, amateescu, Pancho, djroshi, dealancer, Wim Leers, jessebeach: Restrict module and theme name lengths to 50 characters.

Issue #1998576 by beejeebus, alexpott, swentel: Make the config import process use full config trees again.

Issue #1957154 by joates, ayelet_Cr, xjm | Berdir: Replace calls to drupal_container()->get('module_handler()') service with Drupal::moduleHandler().

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1981912 by kostajh, theMusician,  Justin M. Woodum: Make reference to INSTALL.txt in system_requirements link to the file when displayed.

Issue #1712250 by alexpott, n3or, cam8001, vijaycs85, Albert Volkman, jibran, heyrocker, chx: Convert theme settings to configuration system.

Issue #1167144 by chx, catch, claudiu.cristea: Make cache backends responsible for their own storage.

Issue #512026 by Berdir, effulgentsia, sun, marcingy, Eric_A, xjm, katbailey, Damien Tournoud, alexpott, beejeebus, pillarsdotnet: Move () storage from cache to new state/key-value system.

Issue #1664844 by alexpott, cweagans, heyrocker, eojthebrave, ACF, Berdir: Convert image toolkits into plugins.

Issue #1547008 by Berdir, Sutharsan: Replace Update's cache system with the (expirable) key value store.

Issue #1845402 by Crell, amateescu, dawehner, klausi, g.oechsler: Change notice: Update menu link access checks for new router.

Issue #1806334 by dawehner, xjm, tim.plunkett, rootatwc: Convert the node listing at /node to Views.

Issue #1821420 by vijaycs85, cam8001, Albert Volkman, ACF, typhonius, pcambra, Berdir: Convert mail variables to cmi.

Issue #1829224 by alexpott, pfrenssen, vijaycs85, lirantal: Convert the 'theme_default()' variable to CMI.

Issue #1853086 by katbailey, msonnabaum, alexpott: Remove cache.page.enabled in favor of an explicit internal cache setting.

Issue #1515312 by heyrocker, beejeebus, alexpott, xjm, realityloop, sun: Added snapshots of last loaded config for tracking whether config has changed.

Issue #916388 by disasm, podarok, dawehner, andypost, amateescu, Dave Reid: Convert menu links into entities.

Issue #1496480 by mrf, disasm, kbasarab, pfrenssen, cam8001, typhonius, Letharion, ACF, vijaycs85, heyrocker, Berdir, alexpott: Convert file system settings to the new configuration system.

Issue #1899460 by chrisjlee, richard.c.allen2386: Replace duplicate defgroup tags with addtogroup in documentation blocks

Issue #1331486 by katbailey, chx, sun, beejeebus, amateescu: Move module_invoke_*() and friends to an Extensions class.

Revert "Issue #1331486 by katbailey, chx, sun, beejeebus, amateescu: Move module_invoke_*() and friends to an Extensions class. Broke core tests after commit."

This reverts commit c80c3e18.

Issue #1331486 by katbailey, chx, sun, beejeebus, amateescu: Move module_invoke_*() and friends to an Extensions class.

Issue #1873574 by David_Rothstein: Fixed Cron URL on status report page is no longer an absolute URL.