Zabbix

.......PS. [ZBXNEXT-7553] added user macro cache

Merge in ZBX/zabbix from feature/ZBXNEXT-7553-6.1 to master

* commit '88b3209285b5a4a2e7543b54800ed6444ed1f3cc': (71 commits)
  .......PS. [ZBXNEXT-7553] fixed coding style issues, warnings and comments
  .......... [ZBXNEXT-7553] fixed test case
  .......PS. [ZBXNEXT-7553] removed duplicate typedef
  .......PS. [ZBXNEXT-7553] fixed warnigns
  .......PS. [ZBXNEXT-7553] fixed item preprocessing sync
  ........S. [ZBXNEXT-7553] fixed trend function nextcheck calculation error handling
  ........S. [ZBXNEXT-7553] fixed trigger timer rescheduling
  .......PS. [ZBXNEXT-7553] removed unused field from database query when syncing item preprocessing
  .......PS. [ZBXNEXT-7553] added warning when macro parsing fails during macro sync
  ........S. [ZBXNEXT-7553] added user macro cache 'reservation' for the whole server history cache sync
  ........S. [ZBXNEXT-7553] fixed kvs path parsing
  .......PS. [ZBXNEXT-7553] removed unused code
  .......PS. [ZBXNEXT-7553] removed unused variable
  .......PS. [ZBXNEXT-7553] try rescheduling items also after item changes to update expanded delay in cache
  .......PS. [ZBXNEXT-7553] fixed shared memory leak when changing item type from numeric
  .......PS. [ZBXNEXT-7553] fixed memory leak
  .......PS. [ZBXNEXT-7553] fixed active checks staying stupported when delay contains invalid macro
  .......PS. [ZBXNEXT-7553] fixed item rescheduling
  ........S. [ZBXNEXT-7553] fixed memory leak when unknown user macro is used in calculated item filter
  ........S. [ZBXNEXT-7553] fixed uninitialized value access in trend function debug logging
  ...