Issue #2290259 by g3r4, er.pushpinderrana, joshi.rohit100, amitgoyal: Make developer docs for entity reference selection plugins more discoverable
Issue #2290129 by jhodgdon, Gábor Hojtsy, Crell, joachim: Menu/routing topic needs an overhaul.
Issue #1875118 by damiankloip, tim.plunkett: Move resource plugins to correct modules.
Issue #2224847 by pwolanin, damiankloip, danblack, Berdir: Fixed Automatically shorten cid's in Cache\DatabaseBackend and PhpBackend.