Remove comment
Add GameScene
Implemented GameScene
Add GameDestroyer
Remove floor and emenies when call GameDestroyer
Add GameStarter
Remove unused tests
Add insert to SwatShootTimerRepository in EnemySwatInitializer
Fixed fail test
Move FloorPhysicsInitializer to GameInitializer
Insert bullet to BulletRepository in BulletInitializer
Remove all bullets in GaneDEstroyer
Add BulletRepository
Create new displayGroup for bullet if not available
Insert given bullet sprite to bullet group
Remove bullet group when call BulletRepository.removeAll
Implemented BulletRepository.removeAll
Add Item sprite and data