added sound controlling from gamecard
added sound controlling from gamecard

dennis-park/OOGALoompas,jordanly/oogasalad_OOGALoompas,sdh31/tower_defense,garysheng/tower-defense-game-engine,codylieu/oogasalad_OOGALoompas,kevinkdo/oogasalad_OOGALoompas,dianwen/oogasalad_TowerDefense