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Add PlotlyJson extractor for Line Plots

A new extractor "Plotly Json" is now available. It can be used to extract data+style of line plots in a json file following the plotly-json schema. This allows to export line plots generated in catalyst scripts to any library that accepts plotly-json files.

The design follows the current vtkCSVExporter and the Export method of vtkXYChartRepresentation.

We introduce an abstract class vtkAbstractChartExporter and make vtkCSVExporter just a child of it which Allows vtkXYChartRepresentation to be exporter as either CSV or plotly-json file. With the latter we export also the style instead of just the data.

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