Fixed ANRs for:
- URL checking for Github URL with query
- Global politics table
- Playing overlay music in city screen

Flank attack unique works with 'vs' conditionals

Fix rare Android crash where we don't have permissions to copy external mods on app start

Add unique for increased improvement rates rather than decreased build times  - By SeventhM

UI: various improvements mostly relating to centering and WorldScreenTopBar  - By Toxile