Finished EmitCargoOnSell

The broken Lint check is still a problem after all those years. This also does not work as suggested in the empty trait. During selling it destroys the cargo so you can't just queue an Unload activity. You can't even enumerate through all passengers without hitting crashes. However, unloading just the first passenger is good enough for Red Alert's single-manned pillboxes.
Could you please make this visually consistent with UnloadCargo? Set the visual position to the center of the transport, and then MoveIntoWorld to one of the adjacent cells.