terrain animation broken, mobs rendering right

engine/ecs/controller.go

@@ -210,6 +210,13 @@ func (c *Controller) AddSystem(system System, priority int) {
 	}
 }
 
+func (c *Controller) GetSystem(systemType string) System {
+	if system, ok := c.systems[systemType]; ok {
+		return system
+	}
+	return nil
+}
+
 // Process kicks off system processing for all systems attached to the controller. Systems will be processed in the
 // order they are found, or if they have a priority, in priority order. If there is a mix of systems with priority and
 // without, systems with priority will be processed first (in order).