- I backported the new animation setup from Godot4 (So animations don't depend anymore on the rest pose.) Migrated the old animations to the new system. The character has issues with it's arm meshes, that will be fixed later.
- Also ported some related improvements, like the sub gizmo support (still has some issues) (MeshDataresource Editor still needs to be updated to be usable properly again, as now handles aren't shown if something is deselected), ImmediateMesh, hashing Improvements, and the godot4's version of Skeleton Editor.
