Add Agave Items

[boredhero]

• Add item and texture for Agave Seeds, Agave, and Cooked Agave

1. Add an unshaped crafting recipe: 1 Agave --> 1 Agave Seeds
2. Add a smelting recipe: Agave -(100 ticks)-> Cooked Agave
3. Make Cooked Agave an edible food item ~ on par with a baked potato for restoring hunger