* Retarget BizHawk.Emulation.* to .NET Standard 2.0
* Retarget BizHawk.Bizware.BizwareGL to .NET Standard 2.0
In practice this mostly involves moving classes to BizHawk.Client.EmuHawk.
They are still run by the IDE at design-time. To opt-in, set the MSBuild
property MachineRunAnalyzersDuringBuild. From the command-line, you can do this
by adding `/p:MachineRunAnalyzersDuringBuild=true`.