added: allow for defining a function for textureproperties #520
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this allows for a generic f(texture(X)) where f can be scalar or vector
valued.
ideally f would be a function of property name but
as we do not have a base class for f: R -> R^3 we have to use the
f: R^3 -> R^3 type for vector functions. for this reason, both
scalar and vectorial functions have to refer to the texture value as 'x'.