[DF-1785] Test project for color picker
[DF-1785] Color picker widget prototype
[DF-1785] Expander widget experiments
[DF-1785] Color picker refactoring
[DF-1785] Implementation of color editor sub widgets
[DF-1785] Slider control; Qt mouse grabber
[DF-1785] Gradient slider implementation
[DF-1785] Gradient slider mouse support
[DF-1785] Fixed arrow drawing
[DF-4558] Main changes.
[DF-1785] slider implementation
[DF-1785] Fixed slidep positioning bugs
[DF-1785] Impovements
[DF-1785] ColorPicker refactoring
[DF-1785] optimized painting
[DF-1785] Value slider implementation
[DF-1785] ValueSlider implementation
[DF-1785] Fixed direction of sliders
[DF-1785] Color picker mockup
[DF-1785] Color picker fixup