Fixed #19, added textures for 3 powerups, implemented explosive and no collision ball

bin/de/bricked/resources/textures/powerups/1.png

bin/de/bricked/resources/textures/powerups/4.png

bin/de/bricked/resources/textures/powerups/5.png

notes/textures/PowerUp-Template.pdn

src/de/bricked/game/Game.java

src/de/bricked/game/board/Board.java

src/de/bricked/game/powerups/ExtraLifePowerUp.java

src/de/bricked/game/powerups/PowerUp.java

src/de/bricked/game/powerups/PowerUpType.java

...e/bricked/game/powerups/ball/DecreaseBallSizePowerUp.java

src/de/bricked/game/powerups/ball/ExplodeBallPowerUp.java

...e/bricked/game/powerups/ball/IncreaseBallSizePowerUp.java

...de/bricked/game/powerups/ball/NoCollisionBallPowerUp.java

...icked/game/powerups/paddle/DecreasePaddleSizePowerUp.java

...icked/game/powerups/paddle/IncreasePaddleSizePowerUp.java

src/de/bricked/resources/textures/powerups/1.png

src/de/bricked/resources/textures/powerups/4.png

src/de/bricked/resources/textures/powerups/5.png

src/de/bricked/ui/LevelController.java

src/de/bricked/utils/CountdownTimer.java