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Draft: Should build the trajectories faster

Closed Andrii Verbytskyi requested to merge averbyts/athena:faster_trajectory_builder into master

This MR should help to build the truth trajectories faster in the MuonSpectrometer and in the Tracking.

This is done with a reimplementation of the getDaughter() and getMother() functions.

The previous implementation of those functions always created a copy of the particle used in the argument using the truthTrajectoryCuts function, which always returned a pair of particles.

Tag @jojungge @jchapman @christos