Moved MapGrid and MapSquare out of the tools sub-package and into the gui package.
Attempting to establish an MVC architecture and get business logic the hell away from GUI code.  Currently not deleting anything until it is ready to go, but I've added several new classes to comprise the Model layer: Map and Cell being the main ones.  Also made some drastic changes to the Direction enum to take advantage of some of the things that it can do, i.e. ridding me of a separate method for each direction I want to search for adjacent squares in.