Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2496867 by Berdir, swentel, alexpott, rodrigoaguilera, yobottehg, trebormc: Translatable image file is not working unless you also config the image field. Config can get lost anyway

(cherry picked from commit e0516e39)

Issue #2340667 by YesCT, Pedro Lozano, alexpott, martin107: Protect Drupal\Core\Language\Language::id, and use getId().

Issue #2224761 by Gábor Hojtsy, alexpott, pfrenssen, effulgentsia, xjm, mlncn: Add a generic way to add third party configuration on configuration entities and implement for field configuration.

Issue #2164827 by Berdir, Xano, tim.plunkett: Rename the entityInfo() and entityType() methods on EntityInterface and EntityStorageControllerInterface.

Issue #2066535 by tim.plunkett, jsst, Berdir: Add EntityManagerInterface and stop typehinting with EntityManager.

Issue #1953408 by swentel, aspilicious, andypost, yched: Remove ArrayAccess BC layer from field config entities.

Issue #2004244 by Berdir, plach, tim.plunkett, msonnabaum, das-peter: Move entity revision, content translation, validation and field methods to ContentEntityInterface.

Issue #1810370 by plach, kfritsche, berdir, alexpott, xjm, chx: Entity Translation API improvements.

Issue #1754246 by webflo, swentel, penyaskito, andypost, alexpott, YesCT, dagmar: Languages should be configuration entities.

Issue #1935762 by plach: Remove entity_load_unchanged() call from FieldTranslationSynchronizer::synchronizeFields().

Issue #1807692 by plach, YesCT, yched: Added Introduce a column synchronization capability and use it to translate alt and titles through the image field widget.