BAP-5987: Add providers for system calendar
- updated task position calendar
BAP-5987: Add providers for system calendar. Refactoring
Merge pull request #1260 from laboro/ticket/BAP-5987

BAP-5987: Add providers for system calendar
BAP-6570: Add Manage Public Calendars ACL action. Add posibility to remove connected calendar
Merge pull request #1292 from laboro/feature/BAP-5251

BAP-5251: System and User Calendars