[Feature Suggestion] Mute Geometry Dash when it loses focus

[etherealxx]

Since this mod already been able to mute spotify when GD gain focus, would be nice to add feature to mute Geometry Dash when it loses focus (when i change the application to something else, like when i alt tabbing), especially the menu music.

[FireMario211]

love the idea, I believe @Jouca would approve too.