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Add coat darkening and saturation effects (#162)
This PR adds a detailed discussion to the spec of the coat darkening effect (incorporating the ideas discussed in #136 and #141), with: - introduction of a new `coat_darkening` parameter (defaulting to 1, the physically correct case). - a physical definition of how this parameter operates to reduce the darkening (via boosting of the base albedo) - a suggested practical implementation of the darkening factor for the base lobe, taking into account the IOR of the coat, and also the roughness of the base (based on the derivations and discussions linked elsewhere). - A suggested implementation of the darkening of colored coats at grazing angles due to longer path length in the absorbing medium.
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