[1.0.5] unbinding mouse gestures

[Rengaru]

After you set a mouse gesture in the key bindings you can't unbind it.

If you double click on a bound gesture, you can enter a valid character (U/D/L/R) and press backspace to revert the entry back to default ("--") but the game will still react to the input untill you restart the game.

Also for some reason, you can only set gestures in the key binding menu when you are playing a character, but not in the main menu.