Fault-Injection does not clear reservations

[Lietze]

Bug: Fault-Injection does not clear reservations

Problem Description

1. What happens:
   Reservations for Trains don't get cleared out when a fault is inserted and everything is calculated again.
2. What is the expected behavior:
   The reservations on every track and on every train should be reset
3. If not VERY clear: Why is this a problem:
   This will most likely lead to trains being stuck after a fault is inserted due to the trains reserved_tracks having a duplicate of the route the train will drive. Also, having too many reservations on a track may lead to unexpected behavior or to some features not working (crossing reserved route)

Steps For Reproduction

I have not tried it, but:

1. run a simulation
2. have trains pass multiple platforms
3. insert the fault right after the train spawned
4. I think it will break after the train has reached the first platform on its trip