New space trait: Plantlife form

[tuomount]

Game is currently missing life form which is plant or mushroom. Idea is that these guys would not need food at all. Instead they would require to have water. Then depending on water level this would limit how much population would be fitted on planet. Let say there could be factor of 2 per water level. So barren would only support 2 population and marine would support 10. Then they would need to have technology called water reservoir which would increase amount of population by 2. There could be even technology which would increase the multiplier. For example planet wide root system could increase factor by one. Another could be called planet wide sap reservoir which could also increase factor by one. This technology would be available only with this space race. They would miss out all farming buildings.