0.11.01 (Nivve) changed religion groups

- Changed religion localisation. Combined religion localisation doesn't
fit in the province view, so I changed all to shorter prefixes.
Ancestral -> Fore; Natural -> Pan;Celestial -> Astro.
- Poly and mono now have their separate religion groups.
0.11.02 (Nivve) Changed spread religion cb

- Only poly or mono religions can use the spread religion casus belli.
I plan to make basic religions able to spread religion through raiding.
It's slower but not impossible for them to expand this way.