Mutation-based stat-up accessibility

Buffs Bird and Cephalopod categories by giving them the remaining Insane-level statup mutations.  Previously, those weren't in any category, so were being useless.

Bird gets PE based on eagles and other extreme-visual-acuity birds, whilst Cephalopod gets IN and DX based on octopi's flexibility, intelligence, and the Cthulhu reference with the expanded head.