Previously the worker thread was constructed before the queue was, leading to
unfortunate race conditions. This fixes that, along with unrelated minor cleanup.
Replaces animator with a simpler system that can overlay multiple
animations
Character animation split into two layers, motion and action.
Walking, running and jumping animations are played on the first
layer, actions such as firing can be overlayed on the second.
More work is needed to limit overlap to only the weapons that make
sense.
