allow to set audio output device

Submitted by Liv

Assigned to Simon Steinbeiß @ochosi

Link to original bug (#12138)

Description

Now Parole allows setting the Video Output device in Settings > Display. Please add an option that will allow to select the Audio Output device.

This is especially important when using HDMI, or an external USB DAC. Most video players like VLC or Gnome MPlayer have such a config option.

Version: 0.8.0