Add support for OpenRaster file format #271
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OpenRaster is just another zip wrapped format with unencrypted
mimetypefile containingimage/openraster. I believe searching formimetypeimage/openrasterat offset 30 is the correct way to detect it.Tested with ora files generated by GIMP & Krita.
spec reference:
https://www.openraster.org/baseline/file-layout-spec.html