The Tripod now has a more relaxed walking animation and a death animation

The tripod's sound effects were removed due to bugs, but I plan to rework them; I hope to get the death animation right. Basically, the tripod falls forward, creates a large explosion on the ground, and catches fire. After one minute, it starts to rust, and after another minute, it disintegrates and vanishes; the dead tripod remains visible for a total of three minutes.