Add some shader source files to trinity

[filipppavlov]

Summary

Refactor and add some of the game project's source shader files to Trinity. This is a very small subset of shaders and include files that are supposed to be project-independent and are strongly related to Trinity's code itself. For example, include
files contain per-object and per-scene constant buffer layouts (as they must match the layout of these buffers in Trinity's C++ code), but they don't contain lighting model code as it is different between game clients.

Shader files are partitioned into public shader include files in shaders/include directory and (private) shader source in other shaders/ directories. Game projects can use Trinity's public includes in their shaders, and they are supposed to compile and use Trinity's source shaders, although they can override them if needed.

Aside from shaders, this PR contains a few fixes and extensions to the Shader Compiler:

• Add "include directory" command-line argument: /I directory will add the directory to the search paths used when looking for include files
• Add a distinction between local and system includes. For system includes, directories provided with /I are searched first.
• Fix a crash when compiling a raytracing shader for dx12 if the shader contains an error not caught by the Shader Compiler itself.
• Move static const variable declarations out of the global constant buffer for dx11 and dx12, and maintain the source order for these const declarations: this fixes a bug when the compiler may rearrange const declarations inside the global constant buffer even if there is a dependency between const because of initializers.

Linked issue (optional)

https://fenriscreations.atlassian.net/browse/PLAT-11863