Add a lossless JPEG cropper

This is more of an MVP, as metadata probably need adjustments.

fiv-jpegcrop.desktop

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+[Desktop Entry]
+Type=Application
+Name=fiv JPEG Cropper
+GenericName=Lossless JPEG Cropper
+Icon=fiv
+Exec=fiv-jpegcrop %u
+NoDisplay=true
+Terminal=false
+StartupNotify=true
+Categories=Graphics;2DGraphics;
+MimeType=image/jpeg;