[aquaria] D-pad support for gamepads

[Dustin Voss]

Added support for gamepad d-pads that advertise themselves as hat switches via SDL. The d-pad quick-change controls work as programmed, and the key config menu can accept d-pad directions in the joystick column.

This change is on the “gamepad-dpad” branch of <http://bitbucket.org/_Agent/aquaria>.

Really, though, there needs to be a way to configure the d-pad through the key config menu, so that you can change the songs that the d-pad activates. Ideally, this could use all 8 d-pad directions. There are two main problems there. First, the key config menu does not have room. Maybe if it were split into two pages? And second, in order to get all 8 directions, we’d need some sort of delay so that when you press to the left/up, you can momentarily be pressing left without effect.

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