Robert Knight

Requires further investigation to determine what the desired behaviour is.

Investigate how VSCode handles terminal and build output.

Completely missed [this PR](https://github.com/microbit-foundation/python-editor-v3/pull/1230) which be used instead by bumping .38 to .39.

> Please can we double check that we don't read main.py from the fs directly anywhere else? We read it using FileSystem read, but not using MicropythonFsHex read/readBytes. So this...

The V2 editor also fails to load hex files without python code: Error occurs during call to `importFilesFromHex` in [`importFilesFromUniversalHex`](https://github.com/microbit-foundation/microbit-fs/blob/f63b5f9c21531ee09c84a5903926bc8ba58f57d2/src/micropython-fs-hex.ts#L384-L386).

This change also allows the user to create an additional file with content. If `main.py` is empty, the saved hex when re-imported will remove `main.py` from the project in the...