* Remove inbox-specific class, widen single column.
* Create user preference for homescreen column layout.
* Add display options "tab" to homescreen.
* Style display options.
* Tweak homepage layout option values.
* Add tracks events for homepage layout.
* Add test coverage for homescreen display options.
* No need to use Fragment component.
* Use named exports.
* Fix display options styling on mobile/narrow viewports.
Don't show the options at all if we're forcing single column.
* Fix linting error.
Fixeswoocommerce/woocommerce-admin#4592
This adds the functionality to support a store setup tab displayed in ActivityPanel. The tab currently just redirects to the home page, rather than implementing the nice-to-haves of displaying the task list in the panel. The reason for this, is that I found it would require significant refactoring of the task list to support this currently.
As part of this I have also refactored rendering of tabs inside into 2 new functional components: <Tabs> and <Tab>. The reason for this is to decompose large untestable components, test them and by virtue of being decomposed they will also be more reusable in future. Ideally would have been refactored to a functional component as well, but it would have been too large a task.
Jeff Stieler
Sam Seay