- clearCells
- flipCurrentTurn
- getWinner
- isCellValueAlreadySet
- isOutOfBounds
- isValid
- isWinningMoveByPlayer
Algorithm adapted from
http://www.ntu.edu.sg/home/ehchua/programming/java/JavaGame_TicTacToe.html
- mark
Mark the current row for the player who's current turn it is. Will perform no-op
if the arguments ar
- restart
Restart or start a new game, will clear the board and win status