Started work on the MainFrame and the global layout. Also made it read in and set the icon.

-Created the MainFrame class, which sets up the window and the global
layout. The layout currently just sets aside blocks of window space and
makes the menu bar.
-The MainFrame class also loads in an icon from the project root.
-Created a MainDriver class to serve as an entry point that is separate
from the MainFrame. This way, we can easily create specialized tests
without having to deal with the window.