upmpdcli: Add UPnP icon. Use procd for start/stop. 

Add uci config support for multiple instances

Signed-off-by: Ted Hess <thess@kitschensync.net>
At this point it's just nitpicking but I am just wondering if upmpdcli's UCI config should be consistent with the rest or just be as close as possible to the original intention of the author of upmpdcli.