profile: move calculations out of DivePercentageItem::paint()

The DivePercentageItem is a polygon-item with a custom paint()
method. Calculation of the polygon is done once in replot(),
but calculation of the corresponding colors is done in every
paint() call. The problem is, we have no control over paint().
It is called whenever Qt feels like. Therefore using live
dive data is a dangerous proposition if we ever want to get
rid of the global displayed_dive.

Do all the calculations in replot(). Store the colors in an
additional array of the same size as the polygon.

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

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