Tils Graves

#1 Added Grave Key Texture

• The Grave Key has a texture now when using the ressourcepack. If not, the Key will now look like a poisonous potato.

• The Poisonous Potato has been chosen because, with the component consumable removed, it's truly a completely useless item, which means that the key has no hidden second functionality.

• The retexturing uses the new custom model data introduced in 1.21.4. This means that the datapack is no longer compatible with older versions!