All, here is the first version of the patch that moves to the newapi
usage... yeheee !!
As nobody suggested a new name, i've just chose one, which is
"btaudioservice.h" :-). Of course this can be changed if somebody
prefers a better name :-)

This patch does not bring any new feature by itself, it's goal is only
to get rid from the ipc.h stuff. However is is already quite big, but i
really can't make it smaller without breaking stuff that is known to
work today :-(

I did some basic testing of the patch, which is:
   - play a file using a2dp, seek during playing (audacious)
   - play a file using a2dp, seek during playing (rhythmnbox)
   - play a file using SCO, seek during playing (audacious)
   - record and play file using aplay & arecord.

I didn't notice any regression, but i don't want to fool anybody : such
a big patch will inevitably bring its set of regressions, it's just that
i haven't found them yet :-)

Due to the fairly big nature of the patch, i would suggest to wait for
3.21 before moving to the new api, this will give us the usual time
between two bluez releases to :
   - fix regressions introduced (my job :-) )
   - upgrading the gstreamer plugin to use the new api ( i'd prefer
thiagoss to work on this one (with my support of course), as i've never
put my nose on this part of the code )

As usual, comments are welcome. ;-)

Cheers,

Fabien