Add a copy of the ChartGenerator class. This class will have very reduced functionality and mostly provide the interface defined in OutGenerator and work as a bridge for the Charts that are not in a Diagram (think svg export) This will later replace the ChartGenerator class again after the refactoring is done.

SYMBOLSET
SYMBOL
  NAME 'point'
  TYPE ELLIPSE
  POINTS
    1 1
  END
  FILLED TRUE
END
SYMBOL
  NAME "square"
  TYPE VECTOR
  POINTS
    0 0
    0 1
    1 1
    1 0
    0 0
  END
  FILLED TRUE
END
END