IFWI support

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Intel's Integrated Firmware Images are somewhat related to FVs
see https://slimbootloader.github.io/developer-guides/stitching-ifwi.html
and https://software.intel.com/content/dam/develop/external/us/en/documents/uefi-firmware-enabling-guide-for-the-intel-atom-processor-e3900-series-820187.pdf
and LongSoft/UEFITool#82