Besides owning the navmesh, the A* stepper stores g-scores and f-scores,
displaying which will be helpful for debugging, so we want to be able to
access the whole A* stepper instead of only the navmesh.
Rename `NavcordStepper<...>` to `Navcord<...>. Since the navcord is not
actually considered a true stepper, having the word "stepper" in its
identifier would confuse anyone new to source-diving Topola's code.
Rename Navcord's `.step(...)` to `.step_to(...)` to make it clear
that this is not just a step like in a stepper, but a step to a some
specified position.
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.
These optimize out unnecessary code duplication, reserve vector capacity beforehand by leveraging `Iterator`s and avoid unnecessary double-lookups into HashMaps.
Reviewed-on: https://codeberg.org/topola/topola/pulls/128
Co-authored-by: Alain Emilia Anna Zscheile <fogti+devel@ytrizja.de>
Co-committed-by: Alain Emilia Anna Zscheile <fogti+devel@ytrizja.de>