Popups presently supplies a sourcemap for production debugging. This in itself is useful but unminified sources are preferable since the optimizer may alter the path of execution. This task encompasses the work to continue to ship production sources + sourcemap normally and, only when ResourceLoader's debug mode is enabled, ship unminified sources.
Acceptance criteria
- Visiting a page with debug=1 loads the unminified sources
- Visiting a page normally continues to load the minified sources