// register the CE systems
.register(new AgentVisibilitySystem(eventAgg, entityManager))
.register(new ChatSystem(eventAgg, clientRegistry))
.register(new CommandSystem(eventAgg, entityManager, clientRegistry))
.register(new MovementSystem(eventAgg, entityManager, clientRegistry))
.register(new SchedulingSystem(eventAgg))
.register(new SpawningSystem(eventAgg, clientRegistry));