This adds CalDAV support for app generated calendars,
which are registered to the nextcloud core.
This is done by adding a dav plugin which wraps
all ICalendarProviders into a Sabre plugin (inspired by the deck app).
Add unit test for AppCalendar wrapper plugin and calendar object implementation.
Signed-off-by: Ferdinand Thiessen <rpm@fthiessen.de>
If we load all calendar infos of a principal then we get back an array
and not a single calendar info. This was handled incorrectly and an
array of calendar infos were passed to the calendar implementation,
resulting in interesting bugs.
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
