More Hotkey/Hotkey for microphone sensitivity control.

Add the option to set a hotkey for totally open mic (-100dB) and back again on second tap if there was a manual setting, or otherwise back to "auto" for the purpose of opening a mic at will of the user for playing instruments over discord. In case nobody knew (which let's be real someone knew) instruments sound good over discord if the quality in a VC is high enough, but having to go into settings to turn on a totally open mic so others can hear the tiny nuances in a song could get annoying.