3672 fixed opening raw photos in direct mode
3672 fixed opening raw photos in direct mode

The format needs to be detected upfront; delaying this had unforseen consequences.  Since there's no other place in Shotwell where a format could change after import, it makes sense just to do it in the pre-pre-import step for direct mode.
abrauchli/shotwell,jof/shotwell,polymeris/shotwell,damianmoore/shotwell,abrauchli/shotwell,polymeris/shotwell,jof/shotwell,ritchiewilson/shotwell,jimbonator/shotwell,ritchiewilson/shotwell,ritchiewilson/shotwell,damianmoore/shotwell,jof/shotwell,Sanva/shotwell-gsoc,h4ck3rm1k3/shotwell,damianmoore/shotwell,h4ck3rm1k3/shotwell,polymeris/shotwell,Sanva/shotwell-gsoc,jimbonator/shotwell,Sanva/shotwell-gsoc,jimbonator/shotwell,abrauchli/shotwell,h4ck3rm1k3/shotwell