Merge remote-tracking branches 'origin/8.x' and 'drupal/8.x' into configuration-schema-views
Issue #1945348 by damiankloip: Call decorated storage methods in ViewsUI explicitly.
Issue #1930274 by rootatwc, Berdir: Convert aggregator processors and parsers to plugins.
Issue #1956434 by Berdir, amateescu: Fixed Can't edit nodes with entity reference fields.
Issue #1932336 by damiankloip: Use override free configuration context for SystemConfigFormBase.
Issue #1945326 by tim.plunkett: Rename \Drupal\system\Tests\System\SystemConfigFormBase to \Drupal\system\Tests\System\SystemConfigFormTestBase.
Issue #1952842 by tim.plunkett: Fixed Views UI still uses NOT_USED for page callbacks.
Revert "Issue #1952842 by tim.plunkett: Fixed Views UI still uses NOT_USED for page callbacks."
A little bit too much...
This reverts commit aab7094cdfc72112e10d865f9d4e2568438154ef.
Issue #1876964 by dawehner, tim.plunkett: Improve DX when writing style plugins by adding a renderSingle function.
Issue #1932048 follow-up by yched: Remove unnecessary constructor.
Issue #1953832 by xjm, David_Rothstein: Replace 'target type' on entity reference field settings with something clearer.
Issue #1927884 by Alan D., swentel: Always return an array from field_get_items().
Issue #1948884 follow-up by swentel, YesCT: Fix name of block schema file.
Issue #1942490 by steveoliver, Cottser: Make Twig engine available during install.
Issue #1948884 by vijaycs85, YesCT, Gábor Hojtsy: Create configuration schemas for block and custom_block() modules.
Issue #1833126 by micnap, mgifford, YesCT, craychee: Add more semantic representation of original language in translations UI.
Issue #1902856 by rcaracaus, echoz: Search page results in narrow screens.
Issue #1561362 by Niklas Fiekas, chrisdolby, mtift: Change file_transfer() to use BinaryFileResponse.
Issue #1939024 by Alan Evans, mtift, Crell: Convert action_admin_manage() to a new-style Controller.
Issue #1801356 by dawehner, disasm, amateescu, effulgentsia: Entity reference autocomplete using routes.
Issue #1931976 by linclark, effulgentsia: Support deserialization for hal+json.
Issue #1945418 by tim.plunkett, jaskho: Fixed New-style placeholders in menu_router() table break breadcrumbs, menu tree, etc.
Issue #1847084 by jessebeach, trawekp, LewisNyman, nod_, tarekdj: Fixed Vertical toolbar doesn't work with overlay (measure/track displacing elements better + provide change events for them).
Revert "Issue #1938980 by Crell, rootatwc, tim.plunkett: Move controller derivation to route enhancers."
Temporary rollback; this broke AJAX paths. Working on better test coverage.
This reverts commit 221099b5717292a8d7e4d9f76fc3b93c12a42ef9.
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