Add obs icon and set it as window icon.
Merge pull request #207 from fryshorts/icon

Add obs icon and set it as window icon.
Fix automatic scaling bug

The bug here is that when conversion is active, the source video frame
is initialized with the destination height/width/format instead of the
source height/width/format.
Update information provided by pulseaudio plugin to pulse.

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.