Big rework of Policy Picker UI - By vegeta1k95

G&K Neutral Tile Road Maintenance - By itanasi

Unknown civs displayed as `Unknown civilization` in GP and Diplomacy screens - By alexban011

Fix: tech screen zooms to current tech when opened

Get correct civ-wide stats from City-States for Siam bonuses

By letstalkaboutdune:
- ctrl+U toggles World Screen UI elements
- Trim Nuke SFX

Add new game option: No City Razing - By FiretronP75