re-organized structure for autocorrect

[andreamah]

Description:

Re-named and re-structured some of the code so that autocorrect on the user's code.py/main.py gives accurate results.

Also added docstring so the autocompletion describes functions.

Type of change

• New feature (non-breaking change which adds functionality)

Limitations:

Testing:

• src/microbit/test/*

Checklist:

• My code follows the style guidelines of this project
• My code has been formatted with npm run format and passes the checks in npm run check
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[isadorasophia]

Nice job on the docs update!

[andreamah]

note: not merging this yet, since it will really impact PR #192 's file organization. We want to merge after #192 is merged.

[nasadigital]

LGTM!

[vandyliu]

looks good 🍡