Zabbix

.......... [DEV-3687] refactored trigger event expression macros

* commit '412a437ca2c729bdf8cefbccf381f5914dfed820':
  .......... [DEV-3687] fixed zbx_is_indexed_macro function
  .......... [DEV-3687] fixed includes
  .......... [DEV-3687] moved callback description
  .......... [DEV-3687] fixed style issues
  .......... [DEV-3687] replaced "*UNKNOWN*" string with macro
  .......... [DEV-3687] optimized code
  .......... [DEV-3687] fixed style issues
  .......... [DEV-3687] fixed memory leak in test
  .......... [DEV-3687] fixed includes
  .......... [DEV-3687] refactored trigger event expression macros