cleanup: generalize ExtraDataModel to display data of any dc

The goal here is to remove a dependency on displayed_dive.
While doing so, make the model more general and display any dc.
Pass in the dc of the current dive instead of displayed dive,
since all other tabs are already converted to show data of
the current dive. The QStrings are cached since we generate
them anyway, so we may just keep them. Thus, there is no
danger of the dc becoming invalid.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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