Add support for Extended Gamepad controllers. What defines extended
gamepad controllers can be found here:
https://developer.apple.com/documentation/gamecontroller/gcextendedgamepad
Support has been added for controlling the pointer position using the
left thumbstick, left clicks using the A-button and right clicks using
the B-button. Also the Main menu can be accessed using the Home/Menu
button.
The thumbstick values are received when changed, however if holding the
thumbstick in the same position the valueChangedHandler will not be
called. Therefore store the X- and Y-axis values and begin to poll
readings of the stored values for as long as the thumbstick is out of
the center position.
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