#1 Add a menu interface

[Cyde Weys]

The game doesn't have a menu interface right now, which is bad, especially for school children, because it requires the player to recall all of the commands. A menu that displays many of the less-commonly-used commands would be much better. This could either be written in AWT or Swing, depending on how complicated the interface needs to be (Swing is probably a better choice?).

The suggested menu items include: toggle sound, toggle reverse eating mode, zoom in/zoom out, view food web, pause, return to main menu, and quit.