caldav: support more features for recurring events #105
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The protocol allows clients to ask the server to e.g. expand recurring
events to a set of simple events in a given time-frame, so that the
client does not have to calculate the recurrences.
This commit adds the foundation for support for expand 1,
limit-recurrence-set 2, and limit-freebusy-set 3 functionality.
However, the actual transformation of events returned to clients will
have to be implemented in the backend, which now has the required
information to do so.