7April 1748Update

Commented all of TicTacToe.scala, finished the hard level of comp
player AI, made sure all proper looping happens if user inputs an
invalid input, made sure all catsGame functions work: returns catsGame
= true, checks if the board is full with no winners, etc., added
full(), changed easy level from choosing next available spot to a
random spot with no strategies, gave strategy to hard level to ensure
comp player always wins or it ends in a catsGame,