@ruudk override empty non-native method and native __toString() override implemented 👍

todo: implements check on abstract traits, ref usecases:

• https://3v4l.org/RrkgD from parent
• https://3v4l.org/X2LNT from abstract method from trait

for note: trait with no parent method and not abstract can't have #[Override] if no parent method https://3v4l.org/ACu8F

implemented 🎉 /cc @ruudk @kochen

All checks have passed 🎉 @TomasVotruba I think it is ready 👍

Let's merge 👍

Thank you 👏

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