Connie editor conversion splitoff codemirror

[khanniie]

Fixes #issue-number

Changes:

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

[release-com]

Release Environments

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• p5.js-web-editor
  • app-ted6658.release.editor.p5js.org/
  • preview-ted6658.release.editor.p5js.org/

🔧Environment Status : https://app.release.com/public/Processing%20Foundation/env-4246ac625c

[raclim]

Thanks so much for your work on this! After doing some manual testing, I think this mostly felt good besides an issue with unsaved changes—I attached some videos below to help visualize it!

In the current setup, if I have unsaved changes, the changes would remain.

editor_ver.mov

Here, I think I'm seeing that the unsaved changes disappear on Autosave.

PR_ver.mov

Besides this, I feel like everything else seems to work well for me!