C#: Use var everywhere

csharp/extractor/Semmle.Util/Worklist.cs

@@ -48,7 +48,7 @@ namespace Semmle.Util
         /// </returns>
         public LinkedList<T> GetUnprocessedElements()
         {
-            LinkedList<T> result = internalList;
+            var result = internalList;
             internalList = new LinkedList<T>();
             hasNewElements = false;
             return result;