New feature: VecGeom support in ROOT and conversion of shapes. #156
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Added support for the VecGeom library as external package (-Dvecgeom). Creating new library libConverterVG within geom module. This contains the conversion interface for ROOT shapes into vecgeom ones, activated using the plugin mechanism from ROOT. Included also the class TGeoVGShape bridging TGeoShape methods to either VecGeom solid (navigation) or existing ROOT shape (visualisation and the rest).
The conversion can be done once a ROOT geometry is in memory using:
TVirtualGeoConverter::Instance()->ConvertGeometry()
Once this is done, all TGeo functionality and tests can be accessed as for a standard TGeo geometry.