Reversi Indicator
Instructions to add an indicator showing where you will place a piece.
The indicator should be a somewhat-transparent version of the actual piece.
Draw Handler
- draw-indicator: posn player image -> image.
- draw-h2: game-model -> image. The second draw handler should call the first draw handler to draw the pieces on the board.
Mouse Handler
If your mouse handler does not remember the most recent position of the mouse, you will have to add that now.