Blender Git Loki

GPUShaderDependency: Initial Commit

This is a prototype to support `#include` directive inside glsl sources.
The sources are aggregated into a list before being translated to byte_array.
This list is used to generate a mapping between the filename and the
associated byte_array. For each byte_array, we search for any `#include`
and store the file to merge.

At runtime, for one input filename we concatenate all byte_arrays that
are needed following the include order and avoiding double include.

This is meant to evolve into a fully supported `#include` system.