Notes:
- Add a webdavcommon folder for WebDAV generic resource code
- Move davresource to carddaveresource and make it use the WebDAV code
- For now it tests the CalDAV resource directly on KolabNow (to be changed)
- Only synchronization, not adding / changing / removing WebDAV collections or items (to be implemented)
- Only events are currently supported (todo, freebusy, etc. are to be implemented but should be straightforward)
Weird warning from the threadindexer saying it Found an email without messageId when adding Calendars to the store.Fixed
Fixes T8224