Zabbix

A......... [ZBX-20021] fixed impossibility to import media types of type script with parameters from previous versions

* commit 'f733aff1a5cfbbf175180869205165144ce71729':
  .......... [ZBX-20021] fixed error messages in autotest
  ..F....... [ZBX-20021] marked the "timeout" field as mandatory
  A......... [ZBX-20021] fixed possibility to set an empty timeout for the webhook media type
  A......... [ZBX-20021] fixed order of message templates not being preserved when exporting media types
  A......... [ZBX-20021] fixed webhook parameter sorting when exporting media types
  .D........ [ZBX-20021] added changelog file
  A......... [ZBX-20021] fixed impossibility to import media types of type script with parameters from previous versions