Zabbix

..FG...PS. [ZBXNEXT-6220] removed "Refresh unsupported items" parameter

Merge in ZBX/zabbix from feature/ZBXNEXT-6220-5.1 to master

* commit '5a2fa81da36dda39caf79faa833aeb9b0dfeaad9':
  ...G...PS. [ZBXNEXT-6220] fixed number of rows in config table
  ...G...PS. [ZBXNEXT-6220] fixed unsupported interval for Windows performance counters
  ...G...PS. [ZBXNEXT-6220] fixed unused variables
  ...G...PS. [ZBXNEXT-6220] fixed scheduled interval calculation
  .D........ [ZBXNEXT-6220] edited changelog
  ...G...PS. [ZBXNEXT-6220] removed "Refresh unsupported items" parameter
  ..F....... [ZBXNEXT-6220] removed unsupported item refresh from UI