controller support !

wooo!

finally added controller support! use d-pad or joystick to navigate, and press any button to launch the currently selected game.

windows disclaimer:
the controller i have automatically sends d-pad input as arrow keys, and the A button as enter. this means it will send double movement input, which ive tried to negate with ifs that verify that it isnt moving twice, but its still buggy.

if you primarily use controller input on windows, i recommend setting either disable_keyboard_navigation or disable_controller to false in the config file, which will fix this, ensuring that only one method of input will be used.