Still missing end-game functionality and has some
bugs

Created a window that sets up a new game and a
dummy window based on the generated game. The
move function was split into four functions and
the function that calls these four new functions
was moved to main to better align with the model
view controller design pattern

Using flags, the move function will now reveal
all non-flagged tiles adjacent to a given
position if that position is already revealed

The initial move is now guaranteed to be a square
with no adjacent bombs. The getAdjacent method
no longer returns invalid positions on non-square
boards

Includes methods for initialization, making a move, some
helper functions, printing the board to the terminal,
and testing code in main