[Radar] - Basic functionality / plot

Referencing issue #982 
Should cover the first 5 points of that issue.

Note: branch targeted to radarPlot as a feature branch
Note: only one dataset can be added and while a dataset can have multiple datums, a single datum is the only tested behavior on my end.
I argue that for v1 yes.  For v2, I can envision an updateRDomainer function that will update automatically