Zabbix

.......PS. [DEV-3798] changed atob output to uint8 array to prevent from using atob() to access internal/hidden object properties

Merge in ZBX/zabbix from feature/DEV-3798-6.0 to release/6.0

* commit '734a1c29631d4b74c1246f096bbf6ee1af97b2b1':
  .......PS. [DEV-3798] reworked buffer conversion in js methods expecting binary data
  .......PS. [DEV-3798] changed output of atob() function to Uint8Array, fixed memory leaks with type coercion failures when obtaining string or buffer