Convert and store smudges in map

OpenRA.FileFormats/Map/SmudgeReference.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+namespace OpenRA.FileFormats
+{
+	public struct SmudgeReference
+	{
+		public readonly string Type;
+		public readonly int2 Location;
+		public readonly int Depth;
+		public SmudgeReference( string type, int2 location, int depth )
+		{
+			Type = type;
+			Location = location;
+			Depth = depth;
+		}
+		
+		public override string ToString ()
+		{
+			return string.Format("{0} {1},{2} {3}", Type, Location.X,Location.Y, Depth);
+		}
+
+	}
+}