Change BIntegrator to work across DetDesc and DD4hep

Marco Clemencicrequested to merge
dd4hep-bintegrator into master

Changes:

  • IBIntegrator: get the magnetic field grid as argument
  • BIntegrator: comply to the new version of IBIntegrator
  • MagFieldReader: made functional and use DeMagnet condition instead of IMagneticFieldSvc

Draft because it includes !3530 (merged)

Edited by Michel De Cian

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