Better unit action icons

Solved temporary unique parsing error

bugfix: players can no longer get citystate nations when selecting mod

Thin lines around many round icons

By vegeta1k95:
- Rework of City Screen: new current buildings list + misc changes
- Construction table: ordering change (Civ 5) + add/remove on double-click
- Fix bug, where units do not reveal tiles  ()

By alexban011:
- fixed global politics screen from revealing unknown civs and CityStates