Function write_attendees

Parse out the attendee property and write a row to the calendar_attendee table for each one.

Package: davical\caldav
Copyright: Morphoss Ltd - http://www.morphoss.com/
License: GNU GPL v2 or later version
Author: Andrew McMillan andrew@morphoss.com
Located at caldav-PUT-functions.php

Parameters summary
`integer`	`$dav_id`	The dav_id of the caldav_data we're processing
`vCalendar`	`$ical`	VEVENT or VTODO containing the ATTENDEEs

Return value summary
`null`	null