Prior to iOS 13, to activate the external display we had to do something like:
UIScreen *externalScreen = [[UIScreen screens] objectAtIndex:1];
UIWindow* window = [[UIWindow alloc] init];
window.screen = externalScreen;
However, UIWindow.setScreen is deprecated in iOS 13 and it expects a UIWindowSceen instead via UIWindow.setWindowScene. How do we get a UIWindowScene for the external display?
