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

Issue #2227187 by Mykhailo Gurei, Jalandhar, cs_shadow, mandar.harkare | Berdir: Stop refering to config storage as storage controller.

Issue #1971158 by Berdir, beejeebus, alexpott, amateescu: Add loadMultiple() and listAll() caching to (cached) config storage.