Added South Korea! Plus user interface improvements and balance improvements.

[1.23]

1. Fixed incorrect or broken effects & costs for EV transition, Plant Based Diets, Judicial Independence, Nuclear Fission.
2. Changed scaling for simulation values so in 'value' mode they show difference from the midpoint.
3. Added South Korea as a playable country!
4. Added support for country-specific minister art groups.
5. Improvements to how sensibly the icons are positioned on the main UI.
6. UK now has Tobacco Awareness Campaign enabled to reflect the warnings on packets.
7. Reforestation policy is now slower to implement, and slower to impact the environment.
8. Synthetic meat research now boosts plant based diets, and pleases instead of upsetting environmentalists.
9. Improved election analysis screen so it uses tiny people symbols rather than an ambiguous 'dot'.
10. Slightly boosted impact of voter 'complacency' over time for when they start to take the governments policies for granted.
11. Fixed a bug that artificially limited how complacent voter groups could be at a lower level than it should.
12. Party analysis screen now also uses people icons instead of meaningless dots.
13. Possible fix for rare bug where alt-tabbing to and from the game can lead to 'phantom clicks' on items like the next turn button.
14. Fixed bug where the background fade effect disappeared when canceling an industry privatization.