fix: support for Godot 4.1

[Alexejhero]

Changes made:

• Removed typed for...in variables because Godot 4.1 doesn't support them
• Downgraded some .tres to format version 3, because format version 4 isn't supported in Godot 4.1
• Used custom function instead of type_string, which does not exist in Godot 4.1

I made the changes in the web editor because I didn't want to bother cloning the repo, you can squash the commits :)

I did a proper test in Godot 4.1 and encountered no issues.

Yes, I downloaded the addons folder from github after changing it in web

I did not test in later versions of Godot, but I don't think there's anything here that could break.

[KANAjetzt]

Tested in 4.3 and works! Thank you!

[KANAjetzt]

If we want to keep the type in the loop, we can do something fun like this:

Suggested change

	for mod in mod_data.values():
	if not mod.is_loadable:
	for _mod in mod_data.values():
	var mod: ModData = _mod
	if not mod.is_loadable: