Implement part of favorites infrastructure.  There's now a tab to visit, and the machinery to add favorite items to appear in the tab.  (I've established that it works by adding every recent item to favorites.)
Implement part of favorites infrastructure.  There's now a tab to visit,
and the machinery to add favorite items to appear in the tab.  (I've
established that it works by adding every recent item to favorites.)

There's crucial stuff not yet done:
- Preserve favorites content in device local storage, and remove it (!)
- Provide content item UI for marking an item as a favorite
- Provide favorites and content item UI for removing item from favorites
- Provide setting for local storage capacity limit and machinery for enforcing

At least now the tab goes somewhere.

SpiderOak/so_client_html5,SpiderOak/so_client_html5