Breakout — Milestone #3

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For Milestone #3, your job is to add a ball to the center of the window and make it move when you click the mouse. For now, the ball should simply ignore the paddle and the bricks and treat the bottom wall just like the others.

This part of the project is closely related to the BouncingBall program you wrote for section. The only significant difference is that you need to use the random library to initialize the velocity of the ball, as described in the handout.

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