* [#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
Camille Moussu