* `edit.draw(state)` -- Call this from `App.draw` to display the current
  editor state on the app window as requested in the call to
  `edit.initialize_state` that created `state`.

* `edit.draw(state)` -- Call this from `on.draw` to display the current editor
  state on the app window as requested in the call to `edit.initialize_state`
  that created `state`.

* `edit.update(state, dt)` -- call this from `App.update` to periodically auto

* `edit.update(state, dt)` -- call this from `on.update` to periodically auto