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Fixes #9566
Closes #9567
Motivation / Problem
As reported in #9566, sometimes the only valid path to the next ship destination is behind it.
It's also possible for ships to be stuck like in because they just go back on the same track when hitting a dead end.
Description
The first commit tests paths using forward and reverse direction when leaving a dock, and reverse the ship if it's the best solution.
The second commit tries all possible reverse directions when a dead end is hit.
Limitations
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.