feat: Added new WGMDfunc programmable material
feat(rpict,rvu,rtrace,rcontrib): Added "specdata" and "specpict" pattern primitives
feat(rpict,rtrace,rcontrib,rtpict): Hyperspectral rendering (except photon map)
Added missing #ifdef's for standard C header file
Added ashik2 type for anisotropic Ashikhmin-Shirley BRDF model
Major code reorg, moving mgflib to common and introducing BSDF material
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