stable, incomplete c4 action

OpenRa.Game/Controller.cs

@@ -138,6 +138,7 @@ namespace OpenRa.Game
 			switch( s )
 			{
 			case "Attack": return Cursor.Attack;
+			case "C4": return Cursor.C4;
 			case "Move":
 				if (movement.CanEnterCell(location))
 					return Cursor.Move;

OpenRa.Game/Cursor.cs

@@ -23,5 +23,6 @@ namespace OpenRa.Game
 		public static Cursor Enter { get { return new Cursor("enter"); } }
 		public static Cursor DeployBlocked { get { return new Cursor("deploy-blocked"); } }
         public static Cursor Chronoshift { get { return new Cursor("chrono"); } }
+		public static Cursor C4 { get { return new Cursor("c4"); } }
 	}
 }

OpenRa.Game/Traits/C4Demolition.cs

@@ -8,6 +8,8 @@ namespace OpenRa.Game.Traits
 {
 	class C4Demolition : IOrder
 	{
+		public C4Demolition(Actor self) { }
+
 		public Order IssueOrder(Actor self, int2 xy, MouseInput mi, Actor underCursor)
 		{
 			if (underCursor == null) return null;