Fix NumKeys bindings

This commit fixes hardcoded keybindings. Now:
- Num keys bindable independently from F1-F8 keys
- Num keys decimal codes (Num0 - Num9): 41, 33, (34|64), (35|156), 36, 37, 94, 38, 42, 40
- NumPad keys bindable independently from arrow keys
- NumPad numeric keys decimal codes (NumPad0 - NumPad9): 48 - 57

Example (keyconfig.plist):

	key_roll_left				= 52;		// NumPad4
	key_roll_right				= 54;		// NumPad6
	key_pitch_forward			= 56;		// NumPad8
	key_pitch_back				= 53;		// NumPad5
	key_yaw_left				= 55;		// NumPad7
	key_yaw_right				= 57;		// NumPad9