Missile Combat Part 6, detection rules

Missiles should now be detectable, but cannot as yet detect other
contacts. Three changes remain for missile detection and combat: Make
ordnance groups homogeneous in terms of missile
ordnance(ActiveSensor.cs), update ordnance to check for targets in the
detected contacts like that their own sensor can spot if they have no
MFC tracking(OrdnanceTN.cs), and do the detection rules for
missiles(Faction.cs).