Adds support for USB Joysticks and Gamepads to MaxUAE.
Requires the "HID Utilities Source" sample from Apple be
installed to the same location as maxuae-0.8.22. This can be
downloaded from http://developer.apple.com/samplecode/
Have only tested with one gamepad, but should work for any
device, including two joysticks. Two button support included.
This patch also adds two button support to the numeric
keypad joystick emulation (kbd1), but not to other keyboard
emulations. The second button is the numeric keypad 5 key.