calendar: Port to the Calendar API version 3

Deprecated API:
 • GDataCalendarFeed:timezone, gdata_calendar_feed_get_timezone()
 • GDataCalendarFeed:times-cleaned,
   gdata_calendar_feed_get_times_cleaned()
 • GDataBatchable implementation in GDataCalendarService
 • gdata_calendar_service_insert_event(),
   gdata_calendar_service_insert_event_async()
 • GDataCalendarCalendar:times-cleaned,
   gdata_calendar_calendar_get_times_cleaned()
 • GDataCalendarCalendar:edited, gdata_calendar_calendar_get_edited()

API changes:
 • GDataBatchable implementation in GDataCalendarService will now always
   fail
 • ACLs are temporarily not supported; support for them will be re-added
   in future when they have been ported to the new API
 • Add gdata_calendar_service_insert_calendar_event(),
   gdata_calendar_service_insert_calendar_event_async()

This includes a partial update of the unit tests, but most of them have
been disabled pending updates.

https://bugzilla.gnome.org/show_bug.cgi?id=664353