City-state overhaul, part 1!

- Allowed adding arbitrary global uniques to city state bonuses
- Moddable quest weighting for city-states
- Moved city state icons to separate folder
- Removed backwards compatibility (pre-3.19.4) for missing city-state uniques
- Added conditional support to 'CS gift military units' unique

Removed single-pixel gap in top bar

AbsoluteUnits - Unique Spearmen - By letstalkaboutdune