Shift Actor.Health onto a trait.

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

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -28,7 +28,9 @@ namespace OpenRA.Traits
 		public WarheadInfo Warhead;
 		public int Damage;
 		public DamageState DamageState;
+		public ExtendedDamageState ExtendedDamageState;
 		public bool DamageStateChanged;
+		public bool ExtendedDamageStateChanged;
 	}
 
 	public interface ITick { void Tick(Actor self); }