Game controller support

[dulsi]

Would you be interested in game controller support? I've coded up a quick test. It's currently only implemented in the battle scenes. (On the PS4 controller this isn't even a big deal as the touch pad can be used to navigate the rest of the UI.)

dulsi@0e9cef9

Obviously it still needs to finished. Just figured I'd find out if it is of interest.

(I will probably also add Gamerzilla support at some point. Given the rejection with Legend of Edgar, I suspect that will also be rejected but I'm going to keep trying.)

[stephenjsweeney]

If you're able to implement the support, then that would be good. Keep in mind that the game has been designed around using mouse and keyboard, so it might be a lot harder to play with a controller, if you're after finer aiming.

I'm not opposed to Gamerzilla support, so long as it doesn't make the code convoluted and can be easily separated out if need be.