* [#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
* [#337] added timezone loading from backend
* [#337] changed data structure to allow patching timezone while keeping other datetime params value
* [#337] fixed gap, event create modale sync with settings and added checkbox
* [#337] isBrowserDefaultTimezone is set to true when API return null timezone
Co-authored-by: Camille Moussu <cmoussu@linagora.com>