return concrete trajectories by value from detectors

Gerhard Ravenrequested to merge
concrete-trajectories-from-detectors into master

Instead of returning std:unique_ptr<Trajectory> return, by value, concrete trajectories. This way it is up to the calling code to decide whether or not the trajectory will be (individually) heap-allocated or not -- and it also provides more opportunities for the compiler to optimize.

Must be applied in conjunction with Lbcom!313 (merged), Rec!1380 (merged), Alignment!87 (merged)

Edited by Marco Cattaneo

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