On IOS/UIKit, by default only one GestureRecognizer will trigger at a time. Meaning a Pinch will block a rotation, which may be confusing or frustrating for users.

#3130 added pinch, rotation and a "double tap" gesture recognizer. Let's add the remaining:

UITapGestureRecognizer
UIPinchGestureRecognizer
UIRotationGestureRecognizer
UISwipeGestureRecognizer
UIPanGestureRecognizer
UIScreenEdgePanGestureRecognizer
UILongPressGestureRecognizer
UIHoverGestureRecognizer (Doesn't work on IOS)

Perhaps we can also make the TapGestureRecognizer helper function take the number of taps:
window.recognize_doubletap_gesture(true); -> window.recognize_tap_gesture(true,2); where 2 is the number of taps.

Finally, users may want to define more complex UIGestureRecognizerDelegate behavior. We can allow overriding this with function pointers installed on the WinitView or WinitViewController