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When event is removed under certain circumstances we only receive information
about the base event, not about each recurrence. For that reason we have to
manually resolve recurrence in EventDataIdVisitor to get correct IDs for all
the removed recurrences.

This implements a plugin through ETMCalendar. It eats a lot of
memory. The UI in Plasma won't be available until Plasma 5.7,
so there's no hurry in getting this in (I'm targetting 16.08).

There is no configuration yet, because the current code in
Plasma Digital Clock applet does not implement it yet.