彻底移除xml2json

碰到个问题, 用bin/webot测试的时候, 服务端回复是no, 控制台输出却是false...
一怒之下,彻底移除xml2json.

PS: 一直搞不懂parser里面这段是啥意思, 是xml2json的特殊patch吗?
<pre><code>
// the no will be parsed as false, which is not good
if (d.Content === false) d.Content = 'no';
</code></pre>