This adds the following commands:
* queueid <id>		Add song <id> to the queue.
* dequeue <pos>		Remove song from <pos> from the queue
* queueinfo			List the queue

To the statusfield it adds the following entry:
playlistqueue:	<uid>		UID can be used by clients to track changes in the playlist queue.



git-svn-id: https://svn.musicpd.org/mpd/trunk@6927 09075e82-0dd4-0310-85a5-a0d7c8717e4f