cleanup SyncReport.cs header

OpenRA.Game/Network/SyncReport.cs

@@ -1,10 +1,14 @@
-using System;
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see LICENSE.
+ */
+#endregion
+
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using OpenRA.FileFormats;
-using OpenRA.Support;
-using OpenRA.Traits;
 
 namespace OpenRA.Network
 {