Version two

[tjkuson]

The code needs a rewrite:

• use a piece list rather than a square list;
• reduce the abundance of shared pointers;
• make code easier to read;
• use better modern C++ practices.

[tjkuson]

Board and piece representation is now complete. The next step is to implement the game logic.

[tjkuson]

Probing the board now involves board set boolean logic. Previously, it would check each square for if it were empty and if not, look to at what piece the pointer was pointing. This made it cumbersome to generate and check the legality of moves; hopefully this change will make things easier!