Add checks to make sure the pulseaudio operation objects are actually
valid and the request did not fail right away. Other pulseaudio
functions dealing with the objects expect them not to be NULL,
otherwise they will kill the application with a failing assert.
The plugin now uses the generic name "OBS" to identify itself
to pulseaudio.
Until now the pulseaudio plugin used a placeholder icon for the
mixer to display. Now that we have a real icon installed to the
system we can use that instead.
The defaults functions will now return the default device for the
input/output as provided by pulseaudio.
The default output device is the monitor of the default sink.
The wrapping library uses a global mainloop and context which
allows operations to share the connection. The global mainloop
is created and destroyed based on internal reference counting.
The capture code won't spawn a new thread for each input anymore
but instead just create the recording stream and rely on the
threaded mainloop to execute the read callback when data is available.