FR: Switch audio devices mid-game

[Durandal-Thoth]

Switching audio devices presently requires a relaunch. Definitely a niche issue and not a priority, but having to restart a long mission when my earbuds died was a bit of a rude awakening. Not sure what would need to be done under the hood but according to @MjnMixael the interface side of things shouldn't be an issue as per #5895.

[MjnMixael]

#5927 takes care of the UI already and provides some notes on how this might be accomplished.