Fix garbage code

[lonkaars]

This project is in a garbage state right now, and these are the changes I'm going to make to create a better development experience

• Start using typescript interfaces (Start using typescript interfaces properly #14)
• Move package.json/tsconfig.json etc. to project root so npm start and tsc work from the project root
• Make a BasicElement class that provides an id, $, and html property, which more complex objects can use without redefining id, $ and html every time, but instead just calling super()
• Clean up/rewrite settings.ts
• Start using built-in API's in the settings app when they're completed
• Create a contributing.txt, code-of-conduct.txt and issue-template.txt
• Create readme files for major directories, explaining what each file is for
• Start using some documentation system (typescript?/jsdoc) to document built-in classes