Allow board size input

[nmorduch]

• Make the board construction for loops go to a variable rather than 5
• Set that variable to 5 by default
• Make board construction a function that takes a variable
• Allow input of new dimensions.
  • Probably only after you win a game, to preserve the cleanness of the opening.
  • Alternatively, there could just be a little settings thing in the corner, which allows restart and size change. It could appear after the board fades in
• Check that those dimensions are integer values
  • Or, take the floor
• Reconstruct the board when those values are changed

Later on:

• Save a cookie with preferred board size?