Moves the tidier code and file mode utils out of editor file

[khanniie]

Changes: Moves the tidier code and file mode utils out of editor file and into their own files, refactored to be functional style.

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]

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• p5.js-web-editor
  • app-ted9f2c.release.editor.p5js.org/
  • preview-ted9f2c.release.editor.p5js.org/

🔧Environment Status : https://app.release.com/public/Processing%20Foundation/env-66dbb20274

[raclim]

Thanks so much for your work on this, I think this looks great to me so far!