[Feat] Add MicroPython syntax checking, autocomplete and documentation lookups.

I just noticed that the editor is built on Codemirror.
That allows it to be extended with a Language Server such as Pyright, and with the MicroPython-stubs that allow the editor, and also the users, to understand the **Micro**Python aspects.

I have a demo editor [MicroPython-stubs Playground](https://josverl.github.io/stubs_playground/) running as a static web site - should also be possible to fold that into an Electron app if you are interested.
Would work with any type-checker / LSP that can be hosted in Node, but as Pyright was developed for that platform I started there.