Update hook for sv list #2033

Converts image boxes to use files instead of nodes.  All boxes get the displays updated to use the corresponding view mode.  Node boxes get their plugin keys updated, but I'm not actually sure we'll need that long term.

I'm not positive about any of the view modes for images because we haven't written them yet.  I just updated the options and hoped for the best.  We can fix them as the view modes become available.