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

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

Issue #2501701 by akalata, pwolanin, lauriii, GreenSkunk, cdulude, joelpittet, Cottser: Remove SafeMarkup::set in template_preprocess_color_scheme_form()