Add touch controls as option on non-mobile devices

[Jomy10]

Add a button to show touch controls on devices that are not detected as mobile, but do support touch input. (E.g. for the iPad, or laptops with touch support).

This would require detecting if the device supports touch input through JavaScriptKit, then if the device is not mobile (!isMobile && supportsTouch), show a button (maybe beneath the score?) to show controller.