The ColorPicker module provides access to the standard color
picker dialog.
GetColor(
prompt, rgb)
Show a standard color selection dialog and allow the user to select
a color. The user is given instruction by the prompt string,
and the default color is set to rgb. rgb must be a
tuple giving the red, green, and blue components of the color.
GetColor() returns a tuple giving the user's selected
color and a flag indicating whether they accepted the selection of
cancelled.
