Update CityLocationTileRanker and Automation.kt

[EmperorPinguin]

• I spend a little too much time trying to fix this part of AI city settling via comparing improvement yield stat values, but I din't succeed as I'm not a coder. I decided to go with an approach that works for G&K, and then a more experienced coder can optimize and generalize it as they want.
• Updates citizen assignement to let the AI better manage happiness issues.
• The value of a last copy of unique luxury is valued at 750 in line 251 in TradEvaluation, but at 500 in line 253, which is it? I decided to set them both to an intermediate value of 600.
• Updates the formula for calculating CarryOverFood (it's not entirely correct, as we'd need to take into account the food cost increase of the next citizen as well as existing CarryOverFood, but less wrong), and reduces the base food multiplyer to 2, to be more comparable to the value for citizen assignement.
• Adds evaluation for tile improvement placing and tile yields by buildings (work in progress)

[yairm210]

I'm very much against adding ruleset-specific code, in its current state this is unmergable by my standards

[EmperorPinguin]

I'm very much against adding ruleset-specific code, in its current state this is unmergable by my standards

I get why (I think it's a bit ugly as well), but it's the solution I'm proposing to adress the issue, which hasn't been adressed in the past... however long Unciv exists it seems. What to do?