AVFoundation macOS 10.14 Beta 1 to Beta 2 API Differences

../Frameworks/AVFAudio.framework/Headers/AVAudioEngine.h
Added #def AVAUDIOENGINE_HAVE_AUAUDIOUNIT
Added -[AVAudioEngine connectMIDI:to:format:block:]
Added -[AVAudioEngine connectMIDI:toNodes:format:block:]
Added -[AVAudioEngine disconnectMIDI:from:]
Added -[AVAudioEngine disconnectMIDI:fromNodes:]
Added -[AVAudioEngine disconnectMIDIInput:]
Added -[AVAudioEngine disconnectMIDIOutput:]
AVCompositionTrack.h
Added -[AVMutableCompositionTrack addTrackAssociationToTrack:type:]
Added -[AVMutableCompositionTrack removeTrackAssociationToTrack:type:]
AVMovieTrack.h
Modified -[AVMutableMovieTrack addTrackAssociationToTrack:type:]
Declaration
From- (void)addTrackAssociationToTrack:(nonnull AVMovieTrack *)movieTrack type:(nonnull NSString *)trackAssociationType
To- (void)addTrackAssociationToTrack:(nonnull AVMovieTrack *)movieTrack type:(nonnull AVTrackAssociationType)trackAssociationType

Modified -[AVMutableMovieTrack removeTrackAssociationToTrack:type:]
Declaration
From- (void)removeTrackAssociationToTrack:(nonnull AVMovieTrack *)movieTrack type:(nonnull NSString *)trackAssociationType
To- (void)removeTrackAssociationToTrack:(nonnull AVMovieTrack *)movieTrack type:(nonnull AVTrackAssociationType)trackAssociationType