Added the keys() function to the Map interface, replaced instances of

SimpleMap with HashMap. Discarded SimpleMap.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4122 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/Map.as

@@ -26,6 +26,11 @@ public interface Map
      */
     function isEmpty () :Boolean;
 
+    /**
+     * Return all the unique keys in this Map, in Array form.
+     */
+    function keys () :Array;
+
     /**
      * Store a value in the map associated with the specified key.
      * Returns the previous value stored for that key, or undefined.