We add some preparatory changes including new utility functions, as well
as changes throughout the codebase that reflect the change from single
drives to a list of drives, given multi-writes is coming.
Change-Type: patch
Changelog-Entry: Various preparatory changes to account for
multi-writes.
* feat(GUI): add app to gui folder structure
We add a `lib/gui/app/` folder to help transition to Webpack usage.
Change-Type: patch
Changelog-Entry: Add `lib/gui/app` folder to ease into Webpack usage.
