ENH: Adding my first pass at an experimental vtkContextView based XY chart.
Added a new view to ParaView based on the new vtkContextView work I have been doing in VTK. This code is experimental, and currently only works with the line plot filter. I am actively working on this code, the API may change a little and the interface and view options will certainly be improved. The ContextView proxies are intended to remain very general so that further context view based charts can be added to ParaView more easily. Feedback would be appreciated, I am currently working on adding the proxies to choose the columns to be plotted and to customize the plots (color, thickness, symbols).
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