Port the library to Godot 4.0

[adamscott]

Efforts should be made to port the library to Godot 4.0.

Godot 4.0 brings many features, but a lot of breaking changes. Even the editor itself is in alpha, so stability is not even guaranteed.

[adamscott]

I made some progress.
https://github.com/adamscott/gd-YAFSM/tree/port-4.0

There's still issues still, like duplicating states, but it does not crash and burn. For now.

A master build is needed as some breaking changes were introduced since last alpha 4. All controls rect_ properties were renamed to remove the prefix.

[imjp94]

Thank you!
Feel free to open a pull request for your works, so it can be tested or even contributed by others.

[farfalk]

Hi everyone, I opened a (hopefully) fully functional g4 port based on #47 -> #50

Feel free to check it out. Let me know if it's best to merge it in #47, close it and discuss all of it there, or what else, I'm at your complete disposal :)