Added Base Color radio option, with All and Selection as options. All means all color in build color dialog. Selection means current selection in the left panel of build color.

• If there is only one selection, no need to show this option.

• If the selection is not continuous, new colors should be from the 1st selection.

Support Interpolate by group option. Can now specify number of group members, and interpolate within group.

When selecting more than 2 color lists/palettes in the left or right panel of the Color Manager, right-click will show a Merge Colors option.