Calculate MD5 of string. Different encodings possible. Taken from "Paj's Home" (Paul Johnston), under BSD license.
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.org/scripts/32982/216643/PajHome%20MD5.js
Original source: http://pajhome.org.uk/crypt/md5/md5.html