Made the inbox icon on review request pages a shortcut for

archiving/unarchiving the review request.
The idea behind this change is to make the archiving/unarchiving of

requests a little bit faster for advanced users. 
The shortcut was implemented by adding archive/unarchive click handlers

to the icon. A title attribute was also added to the icon which

dynamically changes to "Archive review request" or "Unarchive review

request". This should help with accessibility and general ease of use.

There were no changes made to any Python files so the Python tests were

not ran for this change. 
The JS tests were ran for these changes.

These changes were implemented off the master branch version of

ReviewBoard which had 6 failures for the JS tests. 
The JS tests when ran on this update had the same 6 failures as in the

master branch JS tests.