openAL now closed on game exit
divided folder data into graphics and sound
added test sound
test sound is now played when player presses "S"
added another sound
added class SoundHandler
added method play() to SoundHandler
a sound is played, when a tower is placed and when it can't be placed
another sound is played
added press button sound
moved SoundHandler to GameComponent
soundhandler now initialized in GameComponent
press button sound now played in start menu
press button sound now played during gameplay
added death sound
death sound is now played
spawn sound is now played
Merge branch 'feature/issue/#1' into develop