* 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
* Use expression bodies in Emulation.Cores, and a few other misc cleanups
* remove unused usings in Emulation.Common
* cleanups in Tables_Direct.cs
* some cleanups in nes boards - redundant code
* remove some redundant array initializers in Emulation.Cores
* cleanup AmstradCPC.Controllers
* use object initializers in a lot of places
* nes mappers - remove disch's notes comments in favor of the nesdev wiki link
* cleanup CdtConverter.cs, mostly use of object initializers
* remove redundant .ToString() calls in Emulation.Cores
* using var in Emulation.Cores
* AmstradCPC/ZXSpectrum - simplify some linq, tabs instead of spaces, a few other misc cleanups
* Use null-propagation in Emulation.Cores
adelikat