Issue #2367747 by Palashvijay4O, andypost, Alienpruts, Cottser, er.pushpinderrana, gaurav.pahuja, pfrenssen, rpayanm, vadim.hirbu: Remove usage of system_rebuild_theme_data()

Issue #2448077 by a_thakur: Clean views.module with remaining deprecated functions: views_get_disabled_views, views_get_enabled_views and  views_get_views_as_options

Issue #2427095 by likin, idebr, prateekMehta: Formatting guidelines are not shown for textareas without WYSIWYG

Issue #2399939 by DickJohnson, LewisNyman, mherchel, idebr, brahmjeet789: Refactor 'admin-panel' CSS component

Issue #2433595 by chx, Berdir: WebTestBase::refreshVariables only resets cache_tags.invalidator.checksum

Issue #2409417 by cafuego, jibran, larowlan: Disabling feed view display does not remove feed header from display it is attached to

Issue #2384863 by Gábor Hojtsy, vijaycs85, rodrigoaguilera: Translation language base field handler should use views field handler, provide unified options

Issue #2289917 by Wim Leers, mdrummond, lauriii, Manuel Garcia, emma.maria, Scionar, davidhernandez: Convert "messages" page element into blocks

Issue #2428643 by Upchuk: Always display the more link causes exception: cannot create a URL to a display without routes

Issue #2445743 by dawehner, Wim Leers: Allow views base tables and entity types to define additional cache contexts

Revert "Issue #2445743 by dawehner, Wim Leers: Allow views base tables and entity types to define additional cache contexts"

This reverts commit a87aff86.

Issue #2445743 by dawehner, Wim Leers: Allow views base tables and entity types to define additional cache contexts

Issue #2433599 by Wim Leers: Ensure every (non-views) pager automatically associates a matching cache context

Issue #2381217 by Wim Leers, dawehner, Fabianx: Views should set cache tags on its render arrays, and bubble the output's cache tags to the cache items written to the Views output cache

Issue #2450151 by yched: Don't try to render all fields (including hidden ones) for single entity display

Issue #2406681 by tstoeckler, hussainweb, alexpott, ParisLiakos, almaudoh, tadityar: Add an autoload.php in the repo root to control the autoloader of front controllers

Issue #1273052 by Chloe Chen: Footer container contents are wider than other page elements in Bartik

Issue #2447831 by gordon: "The content access permissions need to be rebuilt" message not being escaped correctly

Issue #2408491 by joaogarin, mrjmd, vermario, jOksanen: Rewrite button components inline with our CSS standards