Basic Linux / Mac x64 Support

The majority of time since the last update was taken by abstracting away calling convention code to prepare for System V ABI used by Linux and Mac. With that done, adding Linux JIT setup was a breeze. There is still lots to be done for proper System V ABI compatibility as well as dlopen integration, but it is pretty exciting to have a custom backend that works across multiple platforms.

Besides that there were also many smaller changes:

• Fixed encoding of 8-bit SI, DI, BP, SP operands
• Auto-generation of Mass bindings for compiler C structs
• Fixed overload resolution for compile-time calls
• Fixed on-the-stack argument passing
• Fixed incorrectly generated source ranges for macros
• Improved error checking for trying to access runtime results at compile time
• Add a way to fail compilation in meta execution
• Add basic compile-time reflection