Allow for upgrade on recruit screen
The pool of separate unupgraded/upgraded units is tedious. Currently, to recruit an unupgraded unit(in town with upgrade avaible) to an army when I have an upgraded unit in the slots we have to do:
1. move the upgraded unit to the settlement defense
2. recruit an unupgraded unit
3. upgrade it on a separate screen
4. enter the defense screen again
5. move the upgraded units I left there back to army.
This whole operation would be shortened if we would be able to upgrade them on the recruitment screen so they would jump into the upgraded units pool.