[osx/coreaudio] - add method which gets the number of channels inside a stream
[AE/osxsink] - factor the device enumeration out into its own class and unroll that big enumeration loop into logic parts
[osx/coreaudio] - split IsDigital into IsDigital and GetTransportType
[osx/coreaudio] - constify parts of CoreAudioDevice
[settings] - implement update mechanism for audiooutput setting (needed due to new setting format)
[osx] - sync xcode project
Merge pull request #4890 from Memphiz/osxsinkenumerator

[AE/osxsink] refactor the device enumeration for the osx sink