Added Material class and isVeloClosed to DeVP class
In order to build the whole stack in DD4Hep without any DetDesc dependency, 2 changes had to be made :
- adding a new material class, wrapping DD4hep one into a DetDesc like interface
- extend DeVP with a isVeloClosed method
Part of set of MRs !292 (merged) LHCb!3789 (merged) Lbcom!629 (merged) Rec!3126 (merged) Boole!418 (merged) Allen!1021 (merged) Analysis!922 (merged) Moore!1806 (merged) Moore!1822 (merged) Alignment!316 (merged) Panoptes!186 (merged)
Edited by Sebastien Ponce