Issue #1723892 by Berdir, Pancho, das-peter, fago: Support for revisions for entity save and delete operations.

Issue #1717678 by andypost, Berdir, attiks: Fixed Entity::createDuplicate() does not account for uuid property.

Issue #1696640 by fago, effulgentsia, tim.plunkett, dixon_, plach: Add a uniform Entity Property API.

Issue #1738368 by Schnitzel, YesCT, Gábor Hojtsy, c31ck, sun, plach: Fixed Not possible to use the entity getter to retrieve non-translatable field values.