Add vtk geo json reader
This is a port of Gerrit topic 5458 to GitLab. This branch adds a vtkGeoJSONReader class for parsing GeoJSON files and generating vtkPolyData to represent the file contents.
This is a port of Gerrit topic 5458 to GitLab. This branch adds a vtkGeoJSONReader class for parsing GeoJSON files and generating vtkPolyData to represent the file contents.