Zabbix

...G...PS. [DEV-2221] fixed -Wfloat-conversion flag warnings

* commit '489b82637b3ffb27afac968456433c742b5b71dd':
  .......PS. [DEV-2221] fixed more warnings and comments after review
  .......PS. [DEV-2221] fixed partly warnings and comments after review
  .......PS. [DEV-2221] refactored some of the code using int instead of time_t, fixed float conversion warnings again
  .......PS. [DEV-2221] added -Wfloat-conversion warnign flag to backend build
  ...G...PS. [DEV-2221] fixed -Wfloat-conversion flag warnings