Ballhead constraints for FABRIK

[KaruroChori]

Not to be merged yet, as I have not been able to really test its functionality.

godotengine/godot-proposals#750 (comment)
The author referenced a solution of ballhead constraint on the inverse kinematic model for FABRIK. I just ported its code and integrated it in the GUI of Godot.

Any external evaluation is very welcome.

[Calinou]

This PR includes unrelated commits such as aa58cc6 (#61994). You probably created a branch on your fork based on an existing branch with commits on top.

[KaruroChori]

It seems to be accurate :/. I guess this is what happens working on two things at the same time and being me 😄 .

I'm not really sure how to address this now, I should have generated a different branch since the very beginning also for the other pull request to avoid any interference.
I am not very accustomed contributing on public repositories, sorry if miss some aspects of the proper workflow.

[KaruroChori]

In theory, I solved it.

[fire]

The pr currently has some wrong formatting.

Check https://docs.godotengine.org/en/stable/community/contributing/pr_workflow.html

[KaruroChori]

In theory, I had my branch reverted to a commit which was part of master, and applied any relevant change from scratch. The history of commits seems clean as far as I can tell. Could you explain what is the problem specifically?

Or were you referring to the code itself?

[KaruroChori]

It seems like the automatic execution of clang_format.sh I performed is trying to change additional files that I never touched. Some of those changes make sense, like removing trailing spaces, some others do not, like the newline escape sequence for defines. Was that expected behaviour?

[KaruroChori]

Close to ensure a better adherence to the git guidelines of godot.

[Calinou]

Superseded by #62003.