Issue #2444231 by Wim Leers, nlisgo: Fix CacheableInterface so it makes sense (was: "Make Config objects & Entities implement CacheableInterface + add BubbleableMetadata::createFromCacheableObject()")

Issue #2453059 by Wim Leers: Set default render cache contexts: 'theme' + 'languages:' . LanguageInterface::TYPE_INTERFACE

Issue #2452619 by vasike, amateescu, joshtaylor: Move entity_reference_create_field function to EntityReferenceTestTrait

Issue #2396333 by larowlan, effulgentsia, Wim Leers, tim.plunkett: BlockContentBlock ignores cache contexts required by the block_content entity

Issue #2329101 by Wim Leers: CacheableInterface only has a getCacheKeys() method, no getCacheContexts(), leads to awkward implementations

Issue #2374019 by yched, jibran, amateescu: Cleanup the use of custom item properties in EntityReferenceFormatterBase

Issue #2379741 by Wim Leers, damiankloip: Add Renderer::getCacheableRenderArray() to encapsulate which data is needed for caching a render array and have views use it

Issue #2304987 by Berdir, Wim Leers: Fixed Don't invalidate cache tags of referenced entities, use entity list cache tags correctly, add test coverage for entity list cache tags.

Issue #2312093 by alexpott, yched, andypost, swentel | xjm: Rename FieldInstanceConfig to FieldConfig.

Issue #2284103 by alexpott, fabpot, damiankloip, Xano, Xen, Berdir: Fixed Remove the request from the container.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2158003 by Wim Leers, msonnabaum, effulgentsia, moshe weitzman: Remove Block Cache API in favor of blocks returning #cache with cache tags.

Issue #2188565 by Wim Leers, Berdir: Test coverage for Comment, Custom Block, Node, Taxonomy Term and User entity cache tags.

Issue #1998638 by damiankloip, dawehner, kim.pepper, cosmicdreams, alexpott, larowlan, Damien Tournoud: Replace almost all remaining superglobals (, , etc.) with Symfony Request object.

Issue #1998638 by damiankloip, dawehner, kim.pepper, cosmicdreams, larowlan, Damien Tournoud: Replace all remaining superglobals (, , etc.) with Symfony Request object.

Issue #1605290 by amateescu, msonnabaum, Caseledde, damiankloip, beejeebus, catch, Berdir, Wim Leers: Enable entity render caching with cache tag support.