Improve orientation and view appearance management

[defagos]

There might be nothing to do, but at least we should think about modal presentations in Play. Modal presentation (whether built-in like form sheet or custom) might not lead to view (dis)appearance methods being called on the covered view, as it never disappears.

We have a full-screen custom presentation for the player and associated view controller presentation methods. We should check this implementation, maybe improve the method names if they should only be used for full-screen modal presentations, and check whether they also support built-in transitions.

We should also check whether our rotation management during modal presentation and dismissal is correct, and investigate whether the view appearance / disappearance behavior is correct.

I doubt there is a silver bullet approach because of the complexity and diversity of modal presentations, but maybe our current API naming is misleading. Having something that works correctly is important, both from a user experience perspective as for analytics.