Zabbix

.......PS. [ZBXNEXT-8460] added style, function headers and warning fixes

Merge in ZBX/zabbix from feature/ZBXNEXT-8460-6.5 to master

* commit 'a957439616ec4146414607d189bc678a61f12846':
  .......PS. [ZBXNEXT-8460] remove include of types.h
  .......PS. [ZBXNEXT-8460] include style fixes
  .......PS. [ZBXNEXT-8460] include style fixes
  .......PS. [ZBXNEXT-8460] include style fixes
  .......PS. [ZBXNEXT-8460] style fixes and function headers
  .......PS. [ZBXNEXT-8460] fixed value not being explicitly handled in switch and sign convertion errors
  .......PS. [ZBXNEXT-8460] removed redundant NULL check and fixed unchecked return value