Support WebDAV-Push for instant calendar updates

[cweiske]

The WebDAV Push specification lets CalDAV (calendar) and CardDAV (address book) servers notify clients instantly about changes.

Android application DAVx5 supports it, and there is a Nextcloud app DAV Push that adds support for that to Nextcloud calendars and address books. Calendar server RustiCal also supports DAV push.

It would be nice if Thunderbird's calendar would also support this, so that new calendar entries made on my mobile phone instantly sync to the desktop.

The whole thing uses UnifiedPush as base technology, and on the desktop there is KUnifiedPush that can be used by Thunderbird to get notified about those calendar updates.

[Jon]

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