Main Window 
  Button 1:
 
      * Clik to add point
      * Ctrl Clik to remove point
      * Shift Clik to close polygon
  
  Button 2, displacement:
 
      * drag to translate
      * shit drag to zoom
      * wheel to zoom
 
  Button 3 , contextual menu:
 
      * Exit : quit Vino
      * Coul : to swap current colour

Colour Window :

      * Swap current colour
  
 
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