Shift Actor.Health onto a trait.

Known regressions:
 - cnc only
 - health bar colors
 - can't repair buildings

OpenRA.Mods.RA/AutoTarget.cs

@@ -66,8 +66,6 @@ namespace OpenRA.Mods.RA
 		{
 			if (!self.IsIdle) return;
 
-			if (!e.Attacker.Info.Traits.Contains<OwnedActorInfo>()) return;
-
 			// not a lot we can do about things we can't hurt... although maybe we should automatically run away?
 			if (!Combat.HasAnyValidWeapons(self, Target.FromActor(e.Attacker))) return;