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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.
because they just go back on the same track when hitting a dead end.
It's also possible for ships to be stuck like in
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.