Add CalDAV and CardDAV providers

Open Emmanuele Bassi requested to merge ebassi/caldav-rebased into master

CalDAV is a mechanism for sharing and updating calendars over WebDAV.

CardDAV is a mechanism for sharing and updating contacts over WebDAV.

The CalDAV and CardDAV providers allows us to share authentication to CalDAV and CardDAV servers; evolution-data-server already allows access, but we still require Evolution to configure authentication.

Fixes: #1

Edited by Emmanuele Bassi

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