added Interpolation support to ColourPoint and corresponding method #478
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This is a proposition to add interpolation support to ColourGradient.
It adds an enum ColourGradient::Interpolation (only LINEAR and and NONE for now, LINEAR being the current interpolation method, there could be SMOOTH (Ease in-out))
The only thing I can't work out is the rendering of fillGradient, because it seems to rely on lowlevel graphics methods that I don't know at all.
Hope it helps !