The main change in to use the interface orientation and not the device
orientation. This may be different for example when locking the orientation.
This also changes the way orientation changes are detected using the
documented method. However this means dropping support for iOS 7 as this
method is only available since iOS 8, and alternative methods available in
iOS 7 have been deprecated in iOS 13.
Another change is to properly detect the interface orientation instead of
infering it from the view bounds, which was incorrect on some devices.
Setting this property to true indicates the view controller’s preference
to lock the pointer, although the system may not honor the request.
For the system to consider locking the pointer:
The scene must be full screen, not in Split View or Slide Over, with no
other apps in Slide Over.
The scene must be in the UISceneActivationStateForegroundActive state.
The ScummVM iOS7 client fulfills the above so the pointer is locked.
Locking the pointer hides the OS cursor (the dot), however that's wanted
since the ScummVM engine draws its own pointer.
