* Add `main` and `article` roles to stories and story.
* Support `role` and \aria-checked` in buttons, and integrate with sidebar tabs.
* Add `region` role to sidebar, and set caption as `aria-label`.
* Add accessibility roles and labels to static templates.
* Update test fixtures with new ARIA tab attributes.
* adding trim: Last of the macros I think
* adding trim: EditTemplate and ItemSidebarIcon
* adding trim: control panel basics
* Another hidden space to guide the uglifier
* More consistent nested quoting
* Reconciling tests for \whitespace trim
