Moving AdePT Initialization to AdePTTrackingManager::BuildPhysicsTable #283
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Previously AdePTTransport was initialized at AdePTPhysics::ConstructProcess. However at this point the material-cut couples are not yet initialized in Geant4, which means G4HepEM can't be initialized. The workaround was to manually initialize them in the user detector construction.
This PR delays the AdePT initialization until AdePTTrackingManager::BuildPhysicsTable, at which point we have all the information we need.
One downside of this approach is that now we have a pointer to AdePTConfiguration in AdePTTrackingManager, rather than AdePTPhysics being the only user of the configuration.