Make volume viewer colormap construction more flexible #400
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While doing some work with some
ytcolormaps, a few of those colormaps havecolorsmembers that are numpy arrays. Our current colormap construction for the volume viewer assumes thatcolorsis a list, like it is for the matplotlib listed colormaps. This causes element-wise addition rather than concatenation when constructing the RGBA lists with thoseytmaps. This PR modifies the RGBA color construction to handle either case.