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Differential Revision: https://phabricator.kde.org/D24633

where ical was an ancient program for vcs file conversion

Leaving aside the fact that vCalendar is the 20+ year old obsolete
predecessor of iCal, the main reason for this is that a QTimeZone
based KCalCore wont be able to serialize vCalendar "timezones" anymore.
Import of legacy files is not affected.

Approved by Laurent on IRC.

As agreed during the PIM sprint in Toulouse last weekend. It generates
HTML3-style output, doesn't handle recurring events in different timezones
correctly and addresses a use-case that has been better solved by the
meanwhile invented groupware servers.

Temporary file handling has been move to QTemporaryFile already.