Feature request: Support New Game Controllers (i.e. DualShock 4, Xbox Wireless controller)

[tomchandotme]

In iOS 13, some controllers are able to connect with iOS devices, but some functions are missing such as Auxiliary buttons support (Options/Share button of DualShock 4 and Menu/View button of Xbox controller) and visuals adaption (DualShock 4's Cross button is displayed as A button in Delta 1.1).

Please take a look at https://developer.apple.com/videos/play/wwdc2019/616/ and https://developer.apple.com/documentation/gamecontroller/