Hunter: Use GetPointsInRadius() instead of square

[morganchristiansson]

Hunter currently uses square, comments says it should be circle.
Update it to use new GetPointsInRadius() pattern from nofSkinner.cpp to find animals.
Also extract ANIMAL_RADIUS to shared constant used by Hunter, AI Hunter builder and Skinner.

This supports #1946 which displays building radius as outline.

[morganchristiansson]

Need some help here.
Test is failing on auto replay tests where AI behaviour has changed due to square->radius.

AI started bumping replay versions to keep legacy square for backwards compatibility. Is that a solution? But then we leave the old ugly square code in place.
https://github.com/Return-To-The-Roots/s25client/actions/runs/27752624950/job/82121998496?pr=1948

[Flamefire]

AI started bumping replay versions to keep legacy square for backwards compatibility. Is that a solution? But then we leave the old ugly square code in place.

I'd prefer that, it is valuable to keep replay working to recreate failures

[morganchristiansson]

Ran the auto replay test locally and it passes now.
Not entirely happy about adding GameWorldBase::GetReplayMinorVersion() but some method to make current replay file version available is needed.

[morganchristiansson]

Also, my memory may be wrong, but I recall original S2 the hunter would approach prey to within ~2 tiles and shoot at close range.
Observing the hunter in RttR he can be quite far away when shooting. Code says 4 tiles. It's not always clear which animal he's shooting, and sometimes there's other animals closer.

Not really in scope, except changing this might also affect replay compatibility.