Recognize Upgrade class


```
Upgrade Upgrade_AmericaRadar
    DisplayName        = UPGRADE:Radar
    Type               = OBJECT
    BuildTime          = 10.0
    BuildCost          = 500
    ButtonImage        = SARadarUpgrade
    ResearchSound      = NoSound ;Doesn't need a sound because this upgrade is granted immediately!
    AcademyClassify    = ACT_UPGRADE_RADAR
End
```