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Add PHONE_VERSION endpoint handler

Add a phone version endpoint handler so that we respond appropriately when
connecting to a pebble.  The pebble sends this query at the start of an RFCOMM
connection and will assume a bare minimum of supported features if we don't
respond.

The only feature this controls (that I can tell) is whether or not the music
app sends next/previous/pause commands back to us.  Soo...this fixes the music
app so that it actually works.  Yay!
Genericise remote support

You can make p.py control a music app like so:

./p.py remote Spotify