Trouble with interface.html

JSON.parse in the browser doesn't seem to like strings from storage files

That's why we have readStorageJSON - it's definitely there.

It's easier to look in the interface.js file itself where there are a bunch of comments at the top explaining what's available and what it does: https://github.com/espruino/EspruinoAppLoaderCore/blob/1cdcb3405f78ef35f231b9c3df501721bda75525/lib/interface.js