[FEATURE] Implemented a composite RGB curve for Curves filter
Now the curves filter provides two ways of adjusting image brightness: 1) Adjusting a grouped RGB curve 2) Adjusting L channel of Lab separation of the image using 'Lightness' curve http://nonaynever.ru/kwiki/krita/published/L_vs_RGB_curve_comparison Ref T352 CC:kimageshop@kde.org
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