Zabbix

........S. [ZBXNEXT-6954] added new macros for debugging trigger expressions

Merge in ZBX/zabbix from feature/ZBXNEXT-6954-5.5 to master

* commit 'f07ab136f5d6ce886f312b745bad9f3a543bbbca':
  .......... [ZBXNEXT-6954] added changelog
  .......... [ZBXNEXT-6954] added result validation for event acknowledge in int test
  ........S. [ZBXNEXT-6954] fixed warnings, memory leak and renamed function
  ........S. [ZBXNEXT-6954] refactored
  ........S. [ZBXNEXT-6954] added support of new macros for trigger expressions