is a widget for use in a level editing screen. It displays a filled
square (red by default) when there are unsaved changes to the level
- Creates a ChangeDot for the given game, which should be an HEGame instance.
- Colour of the frame, and the filled interior in the "on" state.
- Colour of the interior in the "off" state.
- Distance between the bounds of the widget and the frame.
- Width of the frame.