Refactor TODO

This should be a living document. So if you have any ideas for refactoring stuff, then feel free to add them to this document

Get rid of all Mixins.
Make all standalone components independent from things like global utilities (GeneralUtils is maybe used in table for example)
Check if all polyfills are appropriately initialized and available: Compare to this
Extract all standalone components to their own folder structure and write application independent tests (+ figure out how to do that in a productive way) (fetch lib especially)
Refactor forms to generic-declarative form component
Check for mobile compatibility: Is site responsive anywhere? queryParams of the piece_list_store should all be reflected in the url and not a single component each should manipulate the URL bar (refactor pagination, use actions and state)
Refactor string-templating for api_urls
Use classNames plugin instead of if-conditional-classes