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range: Handle zero-length ranges when calculating overlap

Sebastian Keller requested to merge skeller/gnome-calendar:fix-zero-length-ranges into master

Zero length ranges, such as for events without a DTEND could be considered to overlap a range if they were at exactly the end of the range. The end of a range however is the first date that is supposed to not overlap, so a zero-length range on exactly this point should not be considered overlapping.

This fixes cases where all-day events from the next month could show up on the same day of the current month if they did not have a DTEND.

This also adds tests for all possible cases of such zero-length events overlapping.

Fixes #701 (closed)

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