Created base structures

Started building the structure for Checker, CheckerBoard, and Main game
flow classes.
Structural overhaul

Continued setting up class structures. Added class stubs for GUI and
more methods to Checker and CheckerBoard. Added some basic calls to menu
and allowed user input.
Updated GUI and PlayGame structure
Merge pull request #1 from BrendenAZ/brenden

Brenden
Merge pull request #2 from zachoj10/brenden

Brenden