Add a setting to disable audio ducking of other applications when in a call
I wish to use Jami for video calls where the audio for our session is handled by a different application (SonoBus), however, Jami will decrease the volume of all other audio sources on macOS. Please add the option to disable the ducking / lowering of other audio while a call is in place. Optionally, a video-only call type would be better, however I think less users would want this.