Added color picker widget

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Added keyboard input to color picker

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Added RGB/HSV getter/setters to color picker widget

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Increased color picker size

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Added basic color selector dialog

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Added color dialog event

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>