* [#523] added way to manage attendance for delegated calendars
* [DELEGATION] #523 & #524 changed eventURL calculation for delegated events to have the rigth one
* [#524] added drag and drop authorisation to delegated event
* [#524] added tests
* [#524] support for the permission access
* [#524] no edit when delegated event is not public
* [#490 & #489] Removed duplicated api call to get event data
* [#490] removed arbitrary timezone fallback to UTC/ETC & updated exdate formating
* [#490] updated test and fixed eventdiff utils to properly handle dates
* [#405] added syncToken in calendar params and fetch with sync token
* [#405] changed reload to work with sync-token
* [#405] fixup promise handling, added calendar adding and removing hanlding with refresh
* [#405] fixed event expansion calls
* [#405 & refactor] added helperfunction to get base event uid + refactored synctoken updates management
* [#405] added pMap lib to process event expansion
* [#405] added flag for no synctoken / new synctoken