Moved LineTraj to Detector for DD4hep + cleanup

Cleanup involved dropping BrokenLineTrajectory, AlignTraj, ParabolaTraj, CircleTraj as they were not used anymore

Part of the following set of MRs : Detector!110 (merged) !3294 (merged) Rec!2594 (merged) Phys!1003 (merged) Boole!363 (merged) Run2Support!18 (merged)