.class
zoom functionality

Can now zoom in, out and return to normal.  The zoom when zoomed in or
out, the click to add a living cell event no longer works correctly.
That will be fixed
Changed setup of gridSquare class

I couldn’t get to some of the values I needed to change when zooming in
or out.  So added getters and setters for the square height, width and
for the location of the square in the JPanel