USD DataAlgo : Support conversion of float4 to Color4f
#1327
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This allows us to load the colour shader parameters from the USD files exported from Blender and reported here : https://groups.google.com/g/gaffer-dev/c/yGE-N2SPjx4/m/ukGAEaahCQAJ. To be clear, the Blender export is wrong - it should be creating
colorparameters, because that is the type of the corresponding socket in Cycles. But we also want to be able to load all the data we can from USD, so plugging this hole is a good thing generally.