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

Add uci config support for multiple instances

Signed-off-by: Ted Hess <thess@kitschensync.net>
I agree this may not be the best way to do this.

I am not familiar with how upmpdcli uses the network interface name to determine the UPnP bindings. I will check into this and see what we should do. I had a similar problem in another application and in that instance I wrote procedure to get the correct IP addresses from this info.It worked for both IPv4 & IPv6.