Update Arena.java
Update Arena.java

changed instance of 'snake' to 'player1'
Removed Smiley bar, Added color option to cells
Ben's test Change
Two Snakes, Static Color Variables

The two snakes are dependent on the same length, this needs to be
changed.
Add player2 movement support

player2 can now move using the WASD keys.
the players still both grow when player2 gets a seed
Changed player1 and player 2 start positions

flipped player1 and player2 start positions so that they start on the
same side as their control keys.
player1 starts on the right
player2 start on the left