* 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
* create StateSerializer, an ITextStatable implementation using the Serializer class, and wire it up to the TI83 core
* wire StateSerializer to A2600 core
* wire up StateSerializer to AmstradCPC, C64, and ZXS
* wire up StateSerializer to MSX, A27800, and Coleco
* wire up state serializer to ChannelF, Vectrex, Intellivision
* fix GambatteLink to implement ITextStatable, implement TextSerializer in O2
* StateSerializer - wire up a loadstate callback and implement StateSerializer for NesHawk, a bit of rework to subNesHawk as a result
* fix subneshawk text savestates
* StateSerializer - implement byte[] buffer storing (optionally), wire up to PCE
* implement StateSerializer to SMS, tweak GGLink accordingly
* implement StateSerializer in GBHawk, fix link cores accordingly
* StateSerializer - use Serializer static methods to create serializers
zeromus