Support for old controllers & Faster controller polling frequency.

[phu54321]

Old PS2->USB controller mappers map buttons to DPAD movements. This PR interprets the first DPAD's movement to button 29~32.

~~Due to limitations of gdx-controllers 1.9.0, the key input is tied to the render frame. This can be hacked, but it's for the latter.~~

Joystick polling now happens on the polling thread itself, so it will be much faster.