Implement chess

[JonBergland]

Have the chess be playable and have an workable opponent to play against

[JonBergland]

The chess is made so that always the whites are on the bottom and the blacks on the top. Whoever starts always moves the white ones first.

[JonBergland]

Here the bot starts so when the player tries to move the same pieces (white) it is marked as an invalid move.

Made the player move the black pieces and the test passed.

Also changed the gametype from Tic-tac-toe into Chess to fix the weird actions

[JonBergland]

After running the previous test (testLetBotMoveSeveralTime) and checking the resulting board I found no changes to the board. Tested it twice with the same result. The bot-type is "Random" so the white pieces should be in a different place. Maybe the error is in here?