Zabbix

.......PS. [ZBX-20567] improved preprocessor queue performance with huge numbers of queued items

Merge in ZBX/zabbix from feature/ZBX-20567-5.0 to release/5.0

* commit '4aec304b733aaab44cf8a3c70139c67c867027bf':
  ........S. [ZBX-20567] replaced ptr vector with typed one
  .......PS. [ZBX-20567] fixed pending value flushing
  .......PS. [ZBX-20567] fixed preprocessed value flushing and dependent item processing
  .......PS. [ZBX-20567] improved preprocessor queue performance with items taking long time to preprocess