Tile-able auto Fert I / NH3

This is a fert I factory that prioritizes the use of externally supplied NH3 when available, and automatically produces and supplies NH3 when there is demand (include itself)

If both fertilizer and NH3 backed up and then NH3 decreases first (which is not likely to happen), the restart of NH3 production may fail. However, as long as there is even a small demand for fertilizer, it should eventually recover