Offer Xidi for gamepad fixes

https://docs.microsoft.com/en-us/windows/win32/xinput/xinput-and-directinput#using-the-xbox-controller-with-directinput
Backend implementation is being tracked at HaloSPV3/HXE#336

This issue tracks progress of integration into SPV3 Loader, if it's needed.

I may simply add a button to open Xidi's GUI and call it a day.