C4 demolishable bridges

OpenRA.Mods.RA/BridgeHut.cs

@@ -17,7 +17,7 @@ namespace OpenRA.Mods.RA
 		public object Create(ActorInitializer init) { return new BridgeHut(init); }
 	}
 
-	class BridgeHut
+	class BridgeHut : IDemolishable
 	{
 		public Bridge bridge;
 
@@ -31,6 +31,16 @@ namespace OpenRA.Mods.RA
 			bridge.Repair(repairer, true, true);
 		}
 
+		public void Demolish(Actor self, Actor saboteur)
+		{
+			bridge.Demolish(saboteur);
+		}
+
+		public bool IsValidTarget(Actor self, Actor saboteur)
+		{
+			return BridgeDamageState == DamageState.Undamaged;
+		}
+
 		public DamageState BridgeDamageState { get { return bridge.AggregateDamageState(); } }
 	}
 }