Improvements in the collision with the player bar

The player bar is now divided in five pieces, where each piece
sets a different angle in the trajectory of the ball.
Bugfix in collision with the side wall

In a few times, the ball used to get stuck in the side wall, due to
wrong updates in the X position of the ball.
Merge branch 'master' of https://github.com/jucimarjr/posueagames