DNG Writer: add Fuji S3 PRo RAF support

- pre process metadata with ExifTool before to import RAW data.
The active RAW region computed by libraw is definitively wrong For Fuji Camera. ExifTool allow to turn around this problem.
Pas the RAW image active region properties to DNG SDK.
- Get the Raw data unprocessed from libraw. Do not use libraw::raw2Image(), just libraw::unpack(), and pass data to DNG SDK.
This way still fully compatible with other RAW format as NEF, PEF, ARW, CR2, CR3, ORF, etc.
- Append crop region from original RAW file with Libraw. If this region is valid, we will pass this properties later to DNG SDK.
- Other Fuji RAW files still badly converted as image i right oriented, with right sizes, but it still violet.
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