Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2157963 by lokapujya, alexpott, biguzis, zniki.ru, dimaro, benjf, themic8, jenlampton, subhojit777, thtas, kpv, Noe_, Berdir, thijsvdanker, Cottser, dcam, jhodgdon: Allow + symbol in usernames

Issue #2572777 by andypost, alexpott, attiks, andriyun: Fix 'Squiz.Strings.ConcatenationSpacing' coding standard

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

Issue #2110345 by mr.york, effulgentsia, Désiré, fgm, fago, pfrenssen, stefan.r, Berdir, Rajendar Reddy: Simplify validation constraint implementations for fields.

Revert "Issue #2002162 by klausi, eugene.ilyin: Convert form validation of users to entity validation."

This reverts commit 5b41b6f8.