Machine Gods Civic

This small adds a new civic for machine empires: Machine Gods. This civic works similarly to the Celestial Servant civic found in Edcrab's Overpowered Civics mod, except the secondary species can be a machine species. This secondary species has a very powerful trait that gives +300% resource production, among other bonuses, and also starts out on a special building that outputs Physics, Society and Engineering research - so you can maximise your research right away. On the flipside, build speed is set so low that you will only ever have 1 of these very powerful pops. I envisage this being used for machine empires that worship an especially powerful race. Examples would be the C'tan in Necron Empires, or Reapers from Mass Effect. You can create colony vessels out of them, which I'd like to prevent but I don't know how. You can also build powerful armies from them, but the maintenance cost is very high. Your empire will also occasionally generate leaders from them, but they possess no special advantage.