Describe the solution you'd like
Players should be able to rename a grave in an anvil, place it, and have that name displayed.

Additional context
The rename should persist after being broken; i.e. if you break a grave that was named "Herobrine" you should naturally receive a grave still named "Herobrine".

GraveBlockEntityRenderer.java#L93 was intended to have part of that functionality.. but definitely needs some work.

Commit b76398b resolves this issue:

Commit 334777d added the functionality of displaying custom names on graves, and this one adds the functionality to retrieve the named grave, satisfying both requirements of #9.

Closing.