Adds honey material, gives Ursine mutants a small morale boost for eating honey.

The more Ursine mutations you have, the bigger morale boost you'll get for eating honey. Effect starts at 5+ Ursine mutations, as a lot of mutations are shared with other MUTCATS.
Note that it's not a very significant boost, as honey is rare outside of beehives and the bear MUTCAT has Bad Tempered. Much like the Cowbell feature, this PR is mostly for flavor.