Implement Vector2i/3i/4i methods: distance_to and distance_squared_to

[Chubercik]

This pull request implements distance_to and distance_squared_to methods for Vector2i, Vector3i and Vector4i.

Partially implements #2297, closes #7983.

[Chubercik]

BTW I'm having some trouble squashing the commits - rebase ends up creating two more commits instead of merging them into one. Any suggestions?

[AThousandShips]

You need to use git push --force, you're merging the local and remote branches

[Chubercik]

Thanks, that did the trick.

[lawnjelly]

Note this still needs proposal approval to go foward:
godotengine/godot-proposals#2297 (comment)

(sorry this comment was primarily addressed at reviewers, rather than author)

[Chubercik]

I am aware of that but I don't see how I can further the cause at this point; many people across both linked proposals agree that the addition of distance_to and distance_squared_to makes sense, especially after adding length and length_squared.

Knowing the distance between two points on a grid seems like a very basic functionality for any cell-based game, so it's not like there aren't any real use cases.

If Godot's team's consensus is that such arguments aren't strong enough to go through with this PR, it can be closed or left hanging until stronger argumentation arises, no hard feelings.

[Chubercik]

Also, a certain other game engine has these methods implemented, which might be considered an argument for also having them in Godot:

• Vector2Int.Distance
• Vector3Int.Distance

[Geometror]

Makes sense to me (especially after #53618 got merged), use cases are obvious IMO.

[AThousandShips]

For parity I'd suggest adding the same to godot-cpp

[akien-mga]

Thanks!