The primary focus this release was on high level accessor APIs for
vCard, integration of the Vcard::Maker::Vcard approach into Vpim::Vcard,
and finishing the accessor APIs for iCalendar.

My goals are high-level APIs for vCard and iCalendar encoding and
decoding. iCalendar encoding is the biggest chunk of work incomplete.

Nothing is ever done to the point where it can't be improved, but the
current state is:

- vCard 3.0 encoding - done
- vCard 3.0 decoding - done

- vCard 2.1 => kindof support, nothing further scheduled

- iCalendar decoding - done: event, todo, journal
- iCalendar decoding - done: rrule (some unimplemented features, but
based on zero feedback plus my own experience, it seems to be good
enough)
- iCalendar decoding - todo: valarm
- icalendar encoding - todo... (it's going to look like Vcard