Radar regridder
- Add MRadarRegridder as a data source that regrids MRadarGrid to an MStructuredGrid.
- In produceData, a transformation function is used to calculate the radar grid cells containing each structured grid point.
- the nearest neighbour position each grid point in the structured grid has in the radar grid is saved in a QVector, so it can be reused if the next calculation uses the same grid layouts.