AlgebraSolver Draft 5, new 'Games' feature!

AlgebraSolver Draft 5 is the first update since AS was
added to GitHub. New features:

1.) Games!
        Now you can play simple but fun games in between
        algebra calculations. Procrastination has never been
        easier. New games include:

            - TicTacToe
            - Hangman

2.) Bug fixes, performance enhancements, and added
the ability to play games from the main interface. The
biggest bug fix was in the vertex method of the
Quadratic class, where the opposite value was returned.
Oops!
Vertex bug fix