PulseAudio patch

Hey all,

Out of interest and relative boredom, I wrote a PulseAudio backend (currently based on the simple API) that work for the basic functionality (i.e. outputing PCM).

Supporting the rest of MOC simply requires using the normal API and coping ourselves with PA asynchronicity.

I will probably finish it up to do just that but, since you never know how things get pre-empted, I'm sharing my current patch just so that it doesn't bitrot: http://neteril.org/~jeremie/patch/pulse-simple.patch

Cheers.