Odin-lang bindings generation for bgfx API.

All .sh and .cmd scripts assume that the bgfx repository is in the same parent directory as bgfx-odin.

Generated Odin bindings are in the bgfx directory.
The static bgfx libs need to be built separately and copied to the bgfx/lib directory.

The bindings match the C API with no extra wrappers.
Types are converted to roughly match the common Odin style.

Regenerate new bindings by running a generate script in the gen directory.
Bindings generation requires lua and uses the bgfx IDL scripts.

Minimal example:
odin run example/mini_example.odin -file

mt_example.odin requires the shaders to be built by running a make_shaders script in the example/data directory. Shader building uses the bgfx shader makefile and expects shaderc to be in the bgfx tools directory.