Swtich aqueduct to native direction types
Adviser employer window show workers number on button.
Factory logic improved.
Fix building loading.
Refactoring. Listbox, Scrollbar drawing improved.
Renamed files add;
Empire map improved. cities.model add.Code refactoring and files rename.
cities.model improved.
cities on EmpireMap now interactive.
Fix compile error

- You can't assign a temporary to non-const reference
- You can't use const reference here as map doesn't have operator[] const