Add support for overriding vertex attribute/semantics #181
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By default, spirv-cross assigns the semantic "TEXCOORD#" to vertex input attributes where # is the binding index. I'd like to override these so that the generated HLSL semantic matches up with the names I'm already using to identify vertex attributes (i.e. COLOR or POSITION).
This exposes bindings for the spirv-cross API
CompilerHLSL::add_vertex_attribute_remap.This change includes the changes for #180. I'm happy for them to go in separately or together.