Library providing common functions for calendar-based plugins
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Provides utility functions for calendar-related modules such as

* alarms display and dismissal
* attachment handling
* iCal parsing and exporting
* iTip invitations handling

iCal parsing and exporting is done with the help of the Sabre VObject
library [1]. It needs to be insalled with Roundcube using composer:

  $ composer require "sabre/vobject" "~4.5.1"

[1]: http://sabre.io/vobject/