Configure colors used in the application.
Pressing each button shows color palette dialog box.
Changes the background color.
Changes the color of CPlane grid lines.
Changes the color of X axis (u axis in 2d view) of CPlane.
Changes the color of Y axis (v axis in 2d view) of CPlane.
Changes the color of Z axis of CPlane.
Changes the default draw color of objects.
Changes the highlight color of selected objects.
Resets all of the above colors to the factory settings.