I added permissions and bugfixed the interdimensonal graving

[JustusJG]

Also I learned pull request :)

[StoneLabs]

Ill close this for now and use your code as future reference when i implement them, thanks :)
(youll be coauthered on the commits ofc)

For future reference since you are new to git and github a friendly tip:
Try to only do one thing per PR. For example: One PR for the permissions, one PR for public/private graves and one for flexible grave keys. That way parts can be merged individually easily. Keep at it, git is difficult but once you get the hang its great! 👍

edit/ If you'd like you can open a new PR for the permissions API changes (and nothing else) :)