Parse XML for emojis

[Yuxin Wu]

<img class="qqemoji qqemoji5" text="[流泪]_web" src="/zh_CN/htmledition/v2/images/spacer.gif" />

should be replaced by, for example, [流泪]

[Fangrui Song]

[流泪] 在流浪没时间改

[流泪] 还在流浪，然而还是设法改了

[Yuxin Wu]

可以留着坑位以后改啊 😄
Fixed by 76a99eb