feature: spectral rendering #187
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based on the paper: Physically Meaningful Rendering using Tristimulus Colours https://doi.org/10.1111/cgf.12676
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Implements spectral rendering and dispersive materials.
Wavelength-based rendering is able to simulate light dispersion: light pointed towards a prism will cast a rainbow.
Additionally, there's a massive overhaul of the entire color system of the renderer. This should be much, much more accurate now