This reverts commit ecf2fa72.

This reverts commit c5c075df.

Issue #2229181 by pwolanin, Berdir, fago: MapItem::propertyDefinitions() claims it has a static value property, which is wrong.

Issue #2249113 by tstoeckler, jessebeach: Use an entity save instead of db_insert() in user_install().

Issue #2261369 by Berdir: Introduce a common config entity base class for all bundle config entity types.

Issue #2257835 by tim.plunkett, sun, Jalandhar: Move form submission logic out of FormBuilder into a new class.

Issue #2263351 by Wim Leers: Text Editor's in-place editing plugin broke in-place editing at large due to PHP fatal.

Issue #2198713 by tstoeckler: Add a settings.php variable to allow to discover/enable test extensions at regular runtime.

Issue #2254495 by sun, ParisLiakos, alexpott: Followup to Move language_admin_predefined_list to ConfigurableLanguageManager.

This reverts commit c024e97b.

Issue #2260321 by sun: Use Testing profile instead of Minimal profile in interactive installer tests by default.

Issue #2126761 by Tim Bozeman, SGhosh, Jalandhar: The body field summary textarea indicates it has a description with aria-describedby attribute, but the DOM id value points to a non-existent node.

Issue #2260035 by blueminds | jhodgdon: Hook_field_info_max_weight in field.api.php is not in a group/topic.

Issue #2079863 by filijonka, mrsinguyen, fabricebernhard, Chernous_dn, YesCT: Remove Unused local variable from /core/lib/Drupal/Component Utility/Crypt.php  Transliteration/PHPTransliteration.php  Utility/UserAgent.php  Gettext/PoHeader.php.

Issue #2088027 by tim.plunkett | YesCT: Just placed block keeps changed color even after saving the block layout page.

Issue #2264717 by penyaskito: Convert MigrateDrupal6Test into a reusable abstract class which can be reused for D7 and other migrations .

Issue #2253977 by martin107, Mixologic: Use ConfigFactoryInterface to type hint ConfigFactory, Part II.

Issue #2265913 by pwolanin: LinkGenerator::generateFromUrl() fatal (uncaught exception) with external URL.

Issue #2241249 by Wim Leers: First step in making search results pages cacheable: add the associated SearchPage's cache tag.