Utility singleton for Waze map editor scripts
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/15731/98588/WME%20Util%20Singleton.js
The WME W.ux.Util class is not meant to be used standalone, but rather @required by other scripts as a util class for scripts used within the Waze map editor page
