Save raster data in Data Explorer

Karsten Rinkrequested to merge
rinkk/ogs:SaveRasterDE into master

Added functionality to save raster data to files in the DataExplorer. Effectively, this also implements the functionality of the Raster2ASC-tool in the GUI. Also generalised vtkImageData to GeoLib::Raster conversion, thus streamlining the RasterToMesh-class.

  1. Feature description was added to the changelog
Edited by Karsten Rink

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