Issue #2572619 by attiks, andypost, pfrenssen, vprocessor, tatarbj, andriyun, alexpott: Fix 'Drupal.Classes.ClassDeclaration' coding standard

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

Issue #2002134 by fago, yched, amateescu, effulgentsia: Move TypedData metadata introspection from data objects to definition objects.