Add joystick support so gamepads and VR controllers can select weapons

[knowsshit]

I tried this with GZDoomVR, but it seems like the only way to select a weapon in the wheel is using the mouse (which translate to look around when using VR, and it doesn't really work because of the amount you have to look around) or the weapnext/weapprev keys.

It would be nice if it could be possible to hold a button, use a stick on a controller to quickly select a weapon and then let go of that button to select a weapon. Kind of like the weapon wheel works when playing GTA V or RDR2 with a controller.

[codeflorist]

iAmErmac has made a special fork for VR.