Color Palette Customization

[rashley-iqt]

Describe the feature you are requesting

Allow users to customize the colors when coloring by a specified attribute.

Describe your use case

When presenting data visualized in CRviz the arbitrarily assigned colors can inadvertently undercut the message you are trying to convey. For instance suppose a dataset has a property "Risk" with values low, medium, high, and critical. When coloring by this attribute it is possible for the colors to be assigned as

Risk	Color
Low	Red
Medium	Orange
High	Green
Critical	Blue

which is going to undercut the urgency generally associated with something considered a critical risk.

Explain how this feature supports your use case? Other use cases?

This would nicely complement the feature outlined in #103