Changes to ball-brick collision.

The ball-brick collision event has been limited to happen only
once per frame.
Lost life event and area clear event are now active.

Whenever the player loses a life, the bar and the ball will reposition
themselves to default. The game then waits a second and starts again.
The same happens whenever the player clears the area, except that no
new level is loaded yet. Both of these events are mostly incomplete.