[feature] Support 2D transfer functions
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Description
Pepost from [here](https://github.com/FNNDSC/ami/pull/213#issuecomment-343460993).
Support 2D transfer functions, leveraging gradient information to improve visualization. e.g. to determine coloring and opacity based on pixel scalar intensity and / or gradient magnitude. This may be a separable 1d transfer Functions or a [2d transfer function](https://blog.kitware.com/2d-transfer-function-support-in-gpuvolumemapper/).
In addition to VTK, [ImageVis3D](http://www.sci.utah.edu/software/145-news/software-news-cibc/352-iv3d-2-0.html) also supports this.
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