Zabbix

........S. [ZBXNEXT-8970] implemented faster action execution on Zabbix server

Merge in ZBX/zabbix from feature/ZBXNEXT-8970-6.5 to master

* commit '74884ef192e6578e6712aa7340432a37f47bbb7e':
  ........S. [ZBXNEXT-8970] added one more minor style fix
  ........S. [ZBXNEXT-8970] added minor style fixes
  ........S. [ZBXNEXT-8970] fixed wrong merge conflict resolution
  ........S. [ZBXNEXT-8970] added error message to send IPC functions
  ........S. [ZBXNEXT-8970] fixed style issues
  ........S. [ZBXNEXT-8970] fixed memory leak
  ........S. [ZBXNEXT-8970] removed unnecessary const type qualifier
  ........S. [ZBXNEXT-8970] fixed type casts
  ........S. [ZBXNEXT-8970] fixed recovery operations
  ........S. [ZBXNEXT-8970] fixed possible crash in alert syncer
  ........S. [ZBXNEXT-8970] fixed commit hook
  ........S. [ZBXNEXT-8970] fixed code review warnings in PR
  ........S. [ZBXNEXT-8970] fixed cyclic dependency
  ........S. [ZBXNEXT-8970] fixed compilation warning
  ........S. [ZBXNEXT-8970] fixed bugs and added IPC mechanism for alerter
  ........S. [ZBXNEXT-8970] fixed warnings
  ........S. [ZBXNEXT-8970] make cmocka tests compilable
  ........S. [ZBXNEXT-8970] preliminary commit