Move StateZTraj to TrackFitEvent

Move StateZTraj to TrackFitEvent so that Measurement can itself compute residual and derivatives. Unify names of detector elements for various Measurement types.

Must be applied in conjunction with Alignment!178 (merged) and Phys!922 (merged)

Tr/TrackFitEvent/Event/LinearStateZTraj.h

@@ -11,7 +11,7 @@
 #ifndef LINEARSTATEZTRAJ_H
 #define LINEARSTATEZTRAJ_H
 
-#include "TrackKernel/ZTrajectory.h"
+#include "Event/ZTrajectory.h"
 
 #include "GaudiKernel/SystemOfUnits.h"