Added a Cloneable interface, fixed up a few bits.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4148 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/Cloneable.as

@@ -0,0 +1,10 @@
+package com.threerings.util {
+
+public interface Cloneable
+{
+    /**
+     * Create a clone of this object.
+     */
+    function clone () :Object;
+}
+}