QML UI: make dive list fold dive trips

This makes it MUCH easier to deal with a lot of dives.

Instead of needing a more complicated model we simply use the meta data that
allows us to create the dive trip sections to hide (make invisible + height 0)
all dives that aren't in the selected trip.

I'll admit that this was much easier than I expected it to be.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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