Add idle/playing status to mixer script call

[arpena]

I'm writing a script / daemon to control the volume of my soundbar by sending IR signals to it. I would like to power on / set the correct input when the snapclient starts playing.

The volume script call would be a great place to get this info. I suggest the call could be augmented from: ''' volscript --volume xxx --mute false/true to: ''' volscript --volume xxx --mute false/true --status playing/idle