This is mostly to improve readability. Since we don't check the values
of the continue statuses anywhere anyway, this doesn't result in any
changes to code outside of the router/astar module.
I have replaced all instances of `HashMap<...>` with `BTreeMap<...>`,
of `HashSet<...>` with `BTreeSet<...>`, and all the uses of the `Hash`
trait with `Ord`.
I have done a few manual tests and found the behavior to be
deterministic between the GUI application launches. However, undoing an
autoroute command and then manually executing it once again continues to
produce variable results. I suppose this is because of some bug in the
code where edits are applied. Hence, the issue
https://codeberg.org/topola/topola/issues/46
is only partially resolved.
I ran the following command in Fish shell:
```
reuse annotate --skip-unrecognised --copyright="Topola contributors" --license="MIT" **.{rs,md,toml}
```
The choice of year 2024 in the copyright statements is intentional.
This is an iteration on what was suggested in
https://codeberg.org/topola/topola/pulls/79 .
This removes the need to create a new status type for steppers that
have only one intermediate state, and removes unidiomatic `TryInto<...>`
usage to determine if a stepper has finished.
Previously, rail vertices were not stored but generated on demand from
data stored in a `Triangulation<...>`. This functionality is removed in
favor of storing every vertex in `Navmesh`'s own graph built from the
`Triangulation<...>`, which is now afterwards discarded.
Tests still fail and rails aren't added yet, but this is close enough to
completion for me to commit so that I can now go to sleep without
worrying.