Enhancement Request: Create a Google Sheets Extension/Add-on so one can write/run Pyret right inside the Sheets UI

[bennytheshap]

Pyret is awesome. It would be even more awesome if one could use it to write and run programs right in the Sheets UI. For example, it would be awesome to have a sidebar where I can access a REPL or write/run Pyret programs.

Ideally, the environment provided would already have references to the currently open sheet -- so programs could be shorter/simpler.