This reverts commit e3391535.

Issue #2497113 by catch, dawehner: views_theme() gets 19 types of plugin definition, only needs five

Issue #2254865 by Wim Leers, lauriii, borisson_, JeroenT, alexpott, Fabianx: toolbar_pre_render() runs on every page and is responsible for ~15ms/17000 function calls

Issue #2429443 by vijaycs85, rteijeiro, penyaskito, gloob, xjm, nod_, geertvd, pjonckiere, alexpott, Wim Leers, Gábor Hojtsy, Fabianx, tim.plunkett: Date format form is unusable

Issue #2486433 by damiankloip, Gábor Hojtsy, Wim Leers, dawehner, plach: Make ViewsForm stop marking itself as needing to be cached

Issue #2416831 by cilefen, vasi, tadityar, Noe_, lauriii, akalata, JeroenT, Cottser, davidhernandez: Add an active_theme twig function

Issue #2495833 by alexpott, tim.plunkett, dawehner: Drupal\node\NodePermissions::contentPermissions() is duplicate and dead code

Issue #2495407 by jhedstrom, Noe_, cilefen: Regression: Editing a node with a disabled menu link re-enables that menu link

Issue #2466797 by mikeryan, benjy: Rename migration_groups key to avoid confusion with MigrationGroup support

Revert "Issue #1838242 by jhedstrom, pivica, tim.plunkett, GaëlG, dawehner, Lendude: Provide Views integration for datetime field"

This reverts commit 26b7df5c.

Issue #1838242 by jhedstrom, pivica, tim.plunkett, GaëlG, dawehner, Lendude: Provide Views integration for datetime field

This reverts commit 598ccc57.

Issue #1805054 by Wim Leers, Gábor Hojtsy, effulgentsia, jibran, jessebeach, catch, dawehner, Fabianx, sun, larowlan: Cache localized, access filtered, URL resolved, and rendered menu trees

Issue #1994292 by David_Rothstein, Gábor Hojtsy: LanguageInterface::TYPE_URL (D8) and LANGUAGE_TYPE_URL (D7) have no name or description

Issue #2030191 by andypost, j2r, forbesgraham, henk, InternetDevels, IshaDakota, millerbennett: Clean-up api examples of node module

Issue #2473215 by smccabe, joshi.rohit100, googletorp, drubb, sumitmadan, m4olivei, jmolivas, darol100, meramo: Wrong text if no content types are available