public static bool ContainsSystem(ISCSystem value) => systems.ContainsKey(value.UpdateOrder);
public static void RegisterSystem(this ISCSystem instance) => systems[instance.UpdateOrder] = instance;
public static bool ContainsSystem(ISCSystem value) => systems.ContainsKey(value.UpdateOrder);
public static void RegisterSystem(this ISCSystem instance) => systems[instance.UpdateOrder] = instance;