Shader Preprocessor and shader clean up #166
Merged
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Better handling of reusable GLSL code. Adds ShaderPreprocessor so we can use #include directives in the shader files. Adding this as I want to do the same for Triplanar GLSL code that is in the works (move to a separate file that other shaders can use)
Also removed some old shader files that are not used.
Needs #165 to merge first because this is branched off of it