app: output a dialog to recover images salvaged after a crash.
Since commit d916fedf, GIMP has had the hidden feature to salvage images (if possible) during a crash into a backup folder. This commit finishes the feature by opening a dialog proposing to try and recover the salvaged images. This is not perfect yet since it doesn't "remember" the XCF path (in case it was a previously saved image). The images open as new unsaved and dirty images, but directly from the contents at crash time. For now, it is up to people to figure out what they correspond to, if relevant.
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