* Remove unused ZeromusSynchronizer ISynchronizingAudioBuffer implementation as it hasn't been used in quite some time, also remove unused MetaspuAsyncSoundProvider that is no longer used. Remove some unsed methods on MetaspuSoundProvider
* use switch expression
* remove unused buffer
* remove unused NitsujaSynchronizer, even though it was the default, the only usage of ISynchronizingAudioBuffer is the vecna one
* remove enum ESynchMethod now that it only had 1 option
* expose VecnaSyncrhonizer and remove Metaspu static class
* remove unused method on ISynchronizingAudioBuffer
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