HTML entity decode in web monitoring

[long.chen]

I tested zabbix 3.4, the new functions urlecode or urldecode don't work on html entities in http test, I think we need a function to be created such as "htmlentitydecode", common html entities are carriage return and linefeed in http response.


 --> %0D

 --> %0A

https://github.com/omni-lchen/zabbix-patches