Expand the JRPG example

[josh-perry]

It would be cool to have a fully fleshed out example and the existing JRPG one makes the most sense.

It should be expanded to have:

• Multiple screens
  • Items
  • Magic
  • Equip
  • Status
  • Config
• Menu navigation other than just clicking
  • Keyboard
  • Controller (this is behind Controller support #9 and needs a lot of thought)
  • Mouse should still work
• Sounds
  • Menu move
  • Select
• Hand cursor