moysklad calendar: adding top menu item
fixed clearing of subMenu
added basic calendar display
started in-doc calendar, fixed native menu items reset when clicking on custom item
added inner calendar with perfect display
added saving new tasks, unified calendar logic
turned calendar into a class
finished displaying and editing
added task removal
saving doc type into the task, small fixes
small tweaks of menu items processing
moysklad-scheduled-tasks: fixed positioning, fixed bugs with displaying in-doc calendar; click on read-only event navigates to the corresponding entity
moysklad-scheduled-tasks: fixed inactivating custom menu item after navigating to other location