TODO

✔ Remove dependency on decorators
✔ Synchronized should be a mixin
✔ Behavior items should derive type/name
✔ Precompile behavior traversals
✔ Abstract physics world tick optimizations
✔ Cache current routine for Behaved tick
✔ Apply patches to matter.js ( https://github.com/liabru/matter-js/pulls?utf8=%E2%9C%93&q=is%3Apr+author%3Abchevalier )
✔ Inline traits into entity, remove Proxy
✔ Eliminate immutable.toJS()
✔ Track dirty entity state (entityList.tick())
❌ Investigate visibleEntities path
❌ Investigate lookupEmitListeners path
❌ Investigate visibleBoundingBoxes path
❌ EventEmitter::emit is too hot
❌ entityList.fromJSON()