Some plugins trigger UI when you Kore attempts to browse. We don't want
the Content tab to cause this when the user has only opened the Overview
tab.
For the tabs pinned to the addons view (AddonListContainerFragment),
loading by the usual OffScreenPageLimit rules probably makes sense, as
you can avoid pinning tabs that don't work well.
Refactored AbstractListFragment to make it more generic and allow it to be used by
MediaFileListFragment. This adds support for switching between a single- and multicolumn
view.
Created new abstract class AbstractCursorListFragment for list fragments using a cursoradapter.
Tweaked the Now Playing and Playlist screens to better support YouTube videos
Changed HostConnectionObserver to notify clients not only when the id of what's playing changes but also when the label changes (YouTube videos and pictures for instance don't have ids, so the remote wasn't getting notified of a change in what's playing)