reverted extra food on grass/plains floodplains tiles

Made the production buffs around capitals more iterative instead of spamming a ton of production on a single tile. Also, added 1 food to grassland and plains floodplains.

Now works with Gathering Storm

reverted tundra back to .65 threshold

Undid the extra regions... seems to be creating too many "bald spots". This means the no settler bug will be more prevalent.

Apparently random numbers causes everyone to view different stuff, so the maps must be generated locally the same as they are by the host. Reverted to an algortihm that does the same as the previous one, but without being fully random.

The no settler bug still showing it's head due to not accounting for all numerical possibilities... Instead of using modulo, it now randomizes the array to pull start plots from.

Much better spawn algorithm for both major civs and city states.

Major civs and city-states now have double the chance to get a good spawn, which reduces the chances of no settler and also reduces the chances for a city-state to not spawn.

The no settler bug should be very rare and only happen on maps that are generated smaller than they really should be, and large amounts of empty space should really only happen on maps larger than they really should be. The empty space was happening much more frequently with the old algorithm.

- Made the no-settler bug waaaay more rare... should hardly ever see it now

- set max map retries due to no settler to 10 instead of infinite loop
- made tundra/desert crap starts less probable