revamp of damage notifs; added Explodes

OpenRa.Game/Traits/Unit.cs

@@ -1,11 +1,18 @@
 
 namespace OpenRa.Game.Traits
 {
-	class Unit
+	class Unit : INotifyDamage
 	{
 		public int Facing;
 		public int Altitude;
 
 		public Unit( Actor self ) { }
+
+		public void Damaged(Actor self, AttackInfo e)
+		{
+			if (e.DamageState == DamageState.Dead)
+				if (self.Owner == Game.LocalPlayer)
+					Sound.Play("unitlst1.aud");
+		}
 	}
 }