title: Xamarin Studio after update lost syntax highlighting scheme, can't import
body: <p>I just updated my Xamarin Studio to 4.0.2 (build 18), and now all my custom syntax highlighting is gone!  When I tried to import my saved highlighting scheme, it silently failed.  I noticed that the old highlighting scheme is saved in an XML format (as was also the case with MonoDevelop), and the new highlighting schemes seem to be exported in a JSON format.</p>
  
  <p>Is there a way I can convert and import my saved highlighting scheme without doing it all manually?</p>