Switch key-composer over to dispatchFocusdEvent

This is a half-baked transition; just enough to make sure it works in
theory. It's certainly not an exhaustive switch. I think the API may
warrant some changing with these results as usage of the keyComposers
is still confusing.
Visualize the application level event target chain

This doesn't work but I suspect issues with the repetition and my simple
custom controller.