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Population growth reworked

This mod aims at a small rework of population growth, to make it more dynamic and realistic.
* updated to be compatible with the mod "Megalopolis Upgrade – Enhanced City System" and any mod that changes any of the files I used as long as they do not change population growth numbers (it should still work but mess up the balance). Now just make it load last and all should be fine.

Main changes are:
1. Geography (climate, vegetation and topography)
2. Development
3. Type of location (rural vs urban), historically cities relied more on migration from rural areas for pop growth
4. Spiritualist (societal value), as more religious populations tend to have higher birth rates.
5. Winter now causes a little negative population growth while in effect
6. Increase in current things that affect population growth, both positively and negatively, except for "abundant free land" (which is a stronger form of available free land) bonus which was too high (1% max)
7. Additionally, rural settlements produce 5% more food, towns further 10% less food and cities further 17% less food.

List of changes to pop growth:


- Hospitals and healing type buildings now give a small pop growth (0.1%)
- Irrigation and canal now gives a little bit more food production (5%)


Societal values:
- Spiritualist gives up to 0.4% pop growth while humanist gives the same as a decrease

Location rank:
- Rural location: 0.001 -> -0.0015 (mostly to balance a bit for the new pop growth from development)
- Town location: new -> -0.003
- City location: new -> -0.007

Location effects:
- Expensive food in province increase effect: -0.001 -> -0.004
- Cheap food in province increase effect: 0.001 -> 0.004
- Devastation impact in population growth: 0.005 -> 0.008
- Looted: -0.005 -> -0.007
- Prosperity population growth: 0.002 -> 0.0025
- Development population growth: new -> 0.0001 (i.e. max = 1%)
- Available free land: 0.002 -> 0.004
- Abundant free land: 0.01 -> 0.002
- Large food stockpiles: 0.01 -> 0.03
- Mild winter: new -> -0.0005
- Normal winter: new -> -0.001
- Severe winter: new -> -0.002
- Overpopulation no more impedes population growth, now scaling -0.01 pop growth (for every 100% overpopulation, it means -1%)

Climate:
- Arid, cold arid, arctic: new -> -0.001
- Continental: new -> -0.0005

Topography:
- Mountains, wetlands: new -> -0.001

Vegetation:
- Desert: new -> -0.0025
- Farmland: new -> 0.001

Buildings:
- Hospitals and healing type buildings: new -> 0.001
- Irrigation and canal now gives a little bit more food production (5%)