Util: documented sys/paths.h.
Util: fixed style in TagsFilterModel.
Util: configurable separator for TagsFilterModel.
Util: any/all tags mode for TagsFilterModel.
Util: documented tags stuff.
Util: fixed style.
Util: fixed DefaultHookProxy style.
Util: no need for Guarded with C++11.
Util: fixed IDPool style.
Util: support dependless actions in QueueManager.
Util: finished Util documentation.