Describe the bug
While on a dedicated server using a skull (or head) on a crafted grave results in a server-wide crash.

Forgotten Graves Version
v2.3.1-mc1.18.1

To Reproduce

1. Craft a grave and place it
2. Try using any head or skull on the grave

Expected behavior
The grave should display the head inside the grave properly.

Additional context
This is occurring because of a reference to the SkullsApi class. The SkullsApi houses references to the EntityModelLayers for each skull (which are used for rendering the skulls). The server fails to properly load the class as the server does not handle rendering of any sort.

This has been fixed and will be part of the next update (which should be coming very soon).

Fixed by commit 573621e.