1. Optimize the pixel drawing routines for speed wherever possible.
2. Work on functions to draw an ellipse, filled ellipse, rectangle, and
   filled rectangle.
3. Create a 32-bit multiplication function. The ellipse method will need this.
4. Consider drawing pixels using XOR masking as an option.
5. Write a comprehensive test program for all the functions.
6. Add specialized functions for horizontal and vertical lines.
7. Add a user-friendly AppleSoft interface to all Resolution ][ calls.
8. Optimize the pixel offset calculations even further. For example,
   we can include the pixel draw and erase masks as part of the X coordinate
   offset so that they don't have to be recalculated each time a pixel
   is drawn.

