GameMenuElement
members:
		private string title
		private List<string> options
		private int activeOptionIndex
functions:
		public GameMenuElement()
		public GameMenuElement(string title)
		
		public void SetTitle(string title)
		public void AddOption(string option)
		public void PreviousOption()
		public void NextOption()
		
		public string GetTitle()
		public string GetActiveOption()
		public int GetActiveIndex()
		
		
GameMenu
members:
		private string title
		private List<GameMenuElement> menuElements
		private int activeElementIndex
functions:
		public GameMenu()
		public GameMenu(string title)
		
		public void SetTitle(string title)
		public void AddMenuElement(GameMenuElement element)
		public void PreviousMenuElement()
		public void NextMenuElement()
		
		public string GetTitle()
		public GameMenuElement GetActiveMenuElement()
		public int GetActiveIndex()
		
GameScreen
members:
		private GameMenu menu
		private Texture2D backgroundTexture
		
functions:
		public GameScreen()
		public void SetMenu(GameMenu menu)
		
		public void Draw()