Get rid of the cleanup_queue array

[letorbi]

The cleanup_queue array is a really ugly solution and should be avoided.

By adding the info-entry of watch to all its event we could get rid of the cleanup-queue, because the only reason to have it, that we still need the entries in the self.__info dictionary in case get_path() is called. If the info is part of the event, get_path() could get all required information from the event instead of from self.__info.

[letorbi]

The proposed solution might also require that the info.children dictionary contains real references to the related self.__info entries. Otherwise the garbage collector might clean-up stuff too early.