Qt models uniquely for mobile or desktop

[Tomaz Canabrava]

This is something that I didn't wanted to do since the beginning.
our models *should* be both desktop and mobile compatible (with the
exception of the dive list because of the way QT handles Tree Views)
if there's a mobile specific model, we should try to look if it's not a
mistake and if a corresponding model already exists doing the exact same
thing, and only have one model for each thing.
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