11-8-21: Ideas for improvement
1. Click on a square that has already been selected, do not change costumes.
2. Add some color, costumes
3. Detect wins and losses
4. Create a computer player
11-17: Fix bug so that you cannot play in a square that has already been played.
11-19: Added functions to detect wins and ties, and a variable to stop the game.
Look for repetitive code, and find applications for 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