Control-Key Inputs from macOS Mission Control interfering with Boxer

[oliveratgithub]

When playing a game, e.g. «Commander Keen», where the Control (CTRL ^) key is needed to «jump», it's often triggering the switch between desktops of macOS' Mission Control instead.

This happens even with the required Accessibility Setting set to "allow" for the Boxer App.

The Control key input should be directed to Boxer / the running game only.