BuildingType Upgrades Are Not Viable Prerequisites

Before Ares, upgrades did not appear to work as prerequisites -- if you had the upgrade, you still didn't satisfy the prerequisite. In fact, only the most recently constructed BuildingType would be checked to see if it had the upgrade. With Ares, all upgrades on all BuildingTypes are eligible to satisfy any prerequisite logic that a normal BuildingType can.

In addition, upgrades can now satisfy a super weapon's AuxBuilding.

Added in version 0.1.