register expand store as tree component.
tree: implement favorites tab.
implement repository favorites adapter and view.
wire up favorites tab / GUI with storage.
fix scroll position and resizing events.
enable favorites component on favorites tab, so that favorites can be removed.
translate favorite tab title.
update changelog.
use glyphicons.
sort favorites by text.
change favorites styling to be similar to the tabbed view styling.
disable managing favorites on favorites tab.
use "dislike" icon (empty star) for removing a favorite.
add tooltip for adding / removing favorites links.
fix local storage cache purging.
support hard refresh for favorites caches.
explicitly personalize caching keys.

when logging in as another user the caches should be purged in any case.
add a feature flag to the registry for enabling favorites.
improve border styling, required to refactor scrolling.

There is still an issue at the top-right corner:
the width has floating point pixels which are rounded differently
per browser and for table-display (header) and block-display (body).

The problem is still visible in chrome with certain window widths but
is reduced to only be visible in some pixels in the corner.
disable favorites component when feature disabled.