Zabbix

A.F....... [ZBXNEXT-1679] implemented value map import/export:
Additional changes:
- added checkbox column in value map list view and bulk "Delete" button
- added "Used in items" column in value map list view and green text "Yes" if value map is used in items or item prototypes
- added value map sorting by name
- added limit for the amount of records and paging in value maps
- replaced built-in confirmation dialog with modal window dialog for image import when selecting "Update existing"
- fixed broken valuemap.get (merged in r56276) when querying mappings, limit is given, but no "valuemapids" parameter is given