feat(mgf2rad): Now handles spectral color translation
feat(rpict,rtrace,rcontrib,rtpict): Hyperspectral rendering (except photon map)
Added randomization to chroma encoding
Added chromaticity encode/decode functions
Made CIE 1931 curves external
Exposed c_toSharpRGB() and c_fromSharpRGB()
Added macro to assign CIE chromaticities
Added spectrum assignment function c_sset()
Added spectral color multiplication
Major code reorg, moving mgflib to common and introducing BSDF material
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