KF on multitrajectory
This is the KF part from !599 (merged).
This MR switches over the KF to use MultiTrajectory instead of a std::vector<TrackState>.
Edited by Paul Gessinger-Befurt
This is the KF part from !599 (merged).
This MR switches over the KF to use MultiTrajectory instead of a std::vector<TrackState>.