Add SPIRVToMSLConverterOptions::platform to track platform. Default to build platform.
Update default SPIRVToMSLConverterOptions MSL version to 2.1.
MoltenVKShaderConverter test MSL compilation use same MSL version as conversion.
Default min perf tracking value to 0.0.
SPIRVToMSLConverter.h reference spirv.hpp via SPIRV-Cross framework.
Update What's New document.
tool now validates converted MSL with a test compilation.
Project build scripts now build dylib and framework in separate build directories
to enable MoltenVKShaderConverter to link to static library instead of dynamic library.
Final Package structure remains the same.
In Debug build, copy dylib dSYM files to Package.
Package/Latest directory now links relative to local Debug or Release directory.
Add install option to Makefile.
MoltenVKShaderConverter tool now validates converted MSL with a test compilation.
Clean up various MSL conversion and compilation error logging.
MVKCommandResourceFactory wrap Metal library compile with autorelease pool.
Build ExternalDependencies with same symbol hiding as MoltenVK to suppress visibility warnings.
Update What's New document.
