#3 MacOS X bundle, icons and appearance

[Brian Foley]

It would be relatively easy, and would make a big improvement
from a visual point of view, to make the maze software into a
proper MacOS X application bundle.

If it was done right, this would mean that we could open
.warwickmaze files by double clicking on them, could have a pretty
application icon, could move the menus into the menubar where
they belong, and could generally behave like a first-class MacOS X
app.