Light shader: https://github.com/joni-mikkola/cocos2d-x-tutorials/commit/8656893a1686019c8e0ddf816d2fa4e19b9ebae2
MusicTo for fade in/fade out music effects https://github.com/joni-mikkola/cocos2d-x-tutorials/commit/2dc80c0559f9dfb09937c02b02f8d456f7f557ab