Library providing common functions for calendar-based plugins
-------------------------------------------------------------
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/
