Spitfire Bird

Adds spitfire birds (small, songbird-like, rainforest-dwelling petral relatives with hummingbird-like fast wingbeats and the ability to extract harmful corrosive chemicals from spitfire trees and spit these chemicals against predators with their specialized nostrils) from The Future is Wild documentary in Minecraft! It can also be used as a closely related false spitfire bird (which mimics the movements and appearance of the true spitfire bird, but is completely harmless and lacks the harmful chemicals in its nostrils).