Doc for stats per policies

Allow multifilter uniques to count for filtering

By tuvus:
- Skip next unit button 
- Better Unit Actions Sorting 

By SomeTroglodyte:
- Centralize infinity symbol 
- More city filters 
- Competition quests in progress display tied leaders (and your place if you're behind) 

Allow AI to consider production bonuses when building  - By SeventhM

Added ConditionalWhenBetweenStatResource unique  - By woo1127