GetTargetQueue -> GetTargets + Exts

OpenRA.FileFormats/Exts.cs

@@ -149,5 +149,10 @@ namespace OpenRA
             // this is probably a shockingly-slow way to do this, but it's concise.
             return xs.Except(ys).Concat(ys.Except(xs));
         }
+		
+		public static IEnumerable<T> Iterate<T>( this T t, Func<T,T> f )
+		{
+			for(;;) { yield return t; t = f(t); }
+		}
 	}
 }