Function also works with Unit, Static Object, Airbase, Weapon
0 = neutral
1 = red
2 = blue
Airbase objects can return 3 if the base has red and blue coalition units within the capture perimeter.
Coalition Object Class Functions: getCoalition, getCountry
Group Class Functions: isExist, activate, destroy, getCategory, getCoalition, getName, getID, getUnit, getUnits, getSize, getInitialSize, getController, enableEmission