Issue #2264943 by FeyP, er.pushpinderrana, _pratik_, gauravkhambhala, Weilinggu, Nikhil_110, joachim, jhodgdon: Queue API topic and hook_queue_info() don't link to one another

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

Issue #2038275 by tim.plunkett, mr.baileys, Sam Hermans: Convert hook_queue_info() to plugin system.