Inspired by https://www.destroyallsoftware.com/screencasts/catalog/text-editor-from-scratch

I did my own in Planck.

A few shortcommings:

1) I couldn't set the terminal in raw mode from within Planck

2) There is no get-ch in Planck

https://github.com/slipset/editor/blob/master/src/editor/core.cljs