[Feature Suggestion] Mute game / app audio on macOS

[waterbubblebug]

The switch for audio to respect the mute switch on iOS devices is great, but unfortunately macOS devices don't have a corresponding mute switch and so on the macOS port of the iOS application there is no way to mute or control the audio level for Delta specifically. This can be inconvenient if the game audio is still loud even at the lowest rung of system volume or if a user wants to listen to other music / videos or take calls while playing a game.

I wouldn't say this feature is high priority but it would be an appreciated QOL update.