Split contents of dom.js among four(4) files

[SilasVM]

Resolves #7308

Changes:

Distributed the code within dom.js, across dom.js, p5.Element.js, p5.MediaElements.js, and p5.File.js. Specific details of the split are detailed in Proposal #7308.

I've had trouble running the npm test command. I was unable to run it on a clean branch, so I don't think this is a direct indication of any issues with my changes. Please let me know if there's an alternate form of testing for this branch

I was also unsure of how to modify lines 13-19 of each file.

• Should dom.js import each new file?
• Do lines 13-16 need modification?

Screenshots of the change:

PR Checklist

• [ ] npm run lint passes
• [x] Inline documentation is included / updated
• [ ] Unit tests are included / updated

Please let me know your thoughts @limzykenneth.