I can't really test my code because I'm having issues getting a formatter to install inside the dev build (or really any extension, seeing as `yarn install` just wants a different version of node from the one I have) but the code changes are simple and should be non-breaking. Build completes with no errors and the setting appears so I'm making the assumption everything works correctly. All I changed were a few if statements and return values.

Add search for iframe based webviews. Fixes #96307
Co-authored-by: NMatt Bierner <matb@microsoft.com>

Syntax token inspector doesn't show font-style changes caused by semantic highlighting. Fixes #123299

- use readonly for static ids
- prefer undefined over null in my code
- remove some obsolete todos
- do not require Promise from action.run()

Fixes #121155

For #120675

This uses a script to add the override keyword to places that need it in the codebase

Note that we can't enable the --noImplicitOverride setting yet since there are still around 200 errors that require further attention