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

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

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.