[tests] - add newly added test subdir to check_dirs var (missed during addition of the osxsink unit test)
[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