Fix Soviets not building some unit types
Remove Soviet medic
Split Plane queue into a Plane queue and a Helicopter queue to stop planes appearing on helipads etc
Add paradrops to Allies 05.
Make hind buildable by Soviets in Allies 05.
Fix logic bug in Allies05Script.ManageSovietAircraft.
Move the aircraft code common to Allies 03 and Allies 05 into MissionUtils
Allies 05: improve orange town, remove some of the sub spam, improve Soviet IC base
Add "liberate town" objective to Allies 05