Updates for RoarAudio backend
To support new parameters 'id' and 'dev' I updated the RoarAudio plugin. The plugin adds some more options and some alias to be more uniform with others (some plugins use 'host', some 'server',... we now support both).
The plugin was mostly re-written using VS API (which requires >= RoarAudio 0.3 which is not newest version).
I attach the updated ao_roar.c directly and updates for ogg123 manpage as patch.
Would be nice if it could be committed and applied.