CMS-3825 Wizard Improvement - Deep-linking improvement

- removed BrowsePanel from constructor AppPanel
- added addBrowsePanel method to AppPanel
- added path parameter to application
- modified AppRouter to set path on the application before loading it
- altered XXXAppPanel to route accordingly to path
- removed unused actions from ContentItemViewToolbar
- modified app.view.CloseAction to use Closeable interface's close method instead of firing event
- fixed the appbar tab menu label styles
- fixed the appbar tab menu selectedIndex wasn't updated when switching to browse panel