Delete ExperimentalTransitRoute if possible

[paulheinr]

Since it is marked as deprecated and pollutes code, it should be deleted if possible
org.matsim.pt.routes.ExperimentalTransitRoute

It is replaced in PersonPrepareForSim with a DefaultTransitPassengerRoute

[vsp-gleich]

What do we do with the conversion in PersonPrepareForSim? I would suggest to keep it for backward compatibility. So I will try to delete the other occurences, right?

[paulheinr]

It is deprecated since 2020. So I would say, it's totally fine that the phase of backward compatibility is over.

[vsp-gleich]

To me it seems all occurences of org.matsim.pt.routes.ExperimentalTransitRoute are needed to read in an old plans file with ExperimentalTransitRoute and have it converted to DefaultTransitPassengerRoute. That means we can either remove that backward compatibilty or there is nothing to be done.