chore: code cleanup

Fix unique parameter type

modding: Added "upon gaining a [unitFilter] unit" trigger condition

chore: moved citiesConnectedToCapitalToMediums to cache

By Gualdimar:
- Limit camera movement within explored region 
- Fixed world wrap coordinates check 

Android: use best possible device frame rate  - By vegeta1k95

Allow filters in the ModOptions "ToRemove" lists  - By SomeTroglodyte

Play city-state music if available  - By Skekdog

Add 'neutral' Flood plains  - By Caballero-Arepa