* Added _hasDataPartRole override as true to the pvc.CartesianChart class. Then, only the HeatGrid chart is overriding to false.
* Added method pvc.BaseChart#_registerInitLegendScenes to allow moving the _initLegendScenes code of the WaterfallChart to the WaterfallPlot.
* Changed the DataPart option to allow external configuration.
* Moved pvc.CategoricalChart#_getContinuousVisibleCellExtent to the CategoricalPlot class.