public EcsSystem(EcsWorld world)
{
this.world = world;
// In case this system was created after entities were already created, populate the lists with all matching entities.
entities = world.GetEntitiesMatchingComponentFilter <TComponentFilter>().ToList();
filters = world.CreateComponentFilters <TComponentFilter>(entities).ToList();
world.OnComponentAdded += OnComponentAdded;
world.OnComponentRemoved += OnComponentRemoved;
world.OnEntityDestroyed += OnEntityDestroyed;
Console.WriteLine("Created " + GetType() + " processing " + EntityCount + " entities.");
}
