Sort tokens within an enum

This allows us to keep a specific ordering regardless of the token order
in the input file (much friendlier for source control!)

Source/Bind/Structures/Enum.cs

@@ -39,7 +39,7 @@ namespace Bind.Structures
 			set { _type = value; }
 		}
 
-        Dictionary<string, Constant> _constant_collection = new Dictionary<string, Constant>();
+        SortedDictionary<string, Constant> _constant_collection = new SortedDictionary<string, Constant>();
 
         public IDictionary<string, Constant> ConstantCollection
         {