AVKit tvOS 14.5 to 15.0 API Differences

Added #def AVKIT_ONLY_EXTERN

Added #def AVKIT_ONLY_API_AVAILABLE

Added #def PLATFORM_SUPPORTS_AVKITCORE

Added -[AVPictureInPictureController invalidatePlaybackState]

Added AVPictureInPictureSampleBufferPlaybackDelegate

Added -[AVPictureInPictureSampleBufferPlaybackDelegate pictureInPictureController:setPlaying:]

Added -[AVPictureInPictureSampleBufferPlaybackDelegate pictureInPictureControllerTimeRangeForPlayback:]

Added -[AVPictureInPictureSampleBufferPlaybackDelegate pictureInPictureControllerIsPlaybackPaused:]

Added -[AVPictureInPictureSampleBufferPlaybackDelegate pictureInPictureController:didTransitionToRenderSize:]

Added -[AVPictureInPictureSampleBufferPlaybackDelegate pictureInPictureController:skipByInterval:completionHandler:]

Added -[AVPictureInPictureSampleBufferPlaybackDelegate pictureInPictureControllerShouldProhibitBackgroundAudioPlayback:]

Added -[AVPictureInPictureControllerContentSource initWithSampleBufferDisplayLayer:playbackDelegate:]

Added AVPictureInPictureControllerContentSource.sampleBufferDisplayLayer

Added AVPictureInPictureControllerContentSource.sampleBufferPlaybackDelegate

Added -[AVPictureInPictureController initWithContentSource:]

Added AVPictureInPictureController.contentSource

Added AVPictureInPictureControllerContentSource

Added -[AVPictureInPictureControllerContentSource initWithPlayerLayer:]

Added AVPictureInPictureControllerContentSource.playerLayer

Added AVPlayerItem.translatesPlayerInterstitialEvents

Added AVPlayerViewController.transportBarIncludesTitleView

Added AVPlayerViewController.customInfoViewControllers

Added AVPlayerViewController.transportBarCustomMenuItems

Added AVPlayerViewController.contextualActions

Added AVPlayerViewController.infoViewActions

Modified AVPlayerViewController.customInfoViewController