Create the infrastructure for a dive plannder based on a tree-model

This doesn't actually do the real work yet, but it creates all the
infrastructure to edit a tree model, and verify the contents for time,
depth and gas mix.

Now we just need the ability to add entries to the tree model (this adds
one fake one, just to test the editing), and then read out the final end
result and turn it into a plan.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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