* Don't save cv_usejoystick/2 because hotplugging changes can be made invalid by next run
* Properly set cv_usejoystick/2 for menu toggling
* Force-disable a player's joystick if setting another player's joystick to the same device
* Properly set cv_usejoystick/2 value of BOTH target player AND other players when hotplugging and unplugging