Maybe we should have our own `base_metrostroi` entity? I don't know if people are intended to have physguns at all when this is more complete, but if so then the `SetPlayer`/`GetPlayer` functionality would be nice for prop protection. Even if not, it'd be nice to override `ENT.Contact` to point at this GitHub repo, and maybe `ENT.Author` to `"Metrostroi Team"` or something.