Improve drops/items/uses of those items, in petz

Per flux's criticism on https://github.com/KaylebJay/tunnelers-bugz/issues/62, we've got some issues in this regard.

[x] Item Drops Implement more diverse drops for all animals. (not new items, just more diverse.) For example, at the moment a camel can only drop a bone at best, a pig can only drop meat, etc. I think it would be cool to make special, extremely rare drops (I can implement an API for this), such as diamond drops or something like that.
[x] Implement uses for items Currently, the following items are unusable: petz:beaver_oil petz:elephant_tusk petz:turtle_shell petz:beaver_fur For the tusk, it'd be cool if an ivory block was implemented. (you dirty poacher!!!) For the turtle shell, it seems like a limited time water breathing sort-of effect could happen. I have no idea about the beaver oil yet. I left out bee items because they will be given uses when I finish my bee release (still working on a lot of pathfinding API).
[x] Uncraftable items petz:blue_stained_wood petz:candy_cane petz:gingerbread_cookie petz:gray_paving_stone petz:red_gables petz:yellow_paving

KaylebJay / tunnelers-bugz