Refactor iinfo, make it properly print subimage and mipmap stats
Refactor iinfo, make it properly print subimage and mipmap stats

mcanthony/oiio,bdeluca/oiio,sambler/oiio,YangYangTL/oiio,OpenImageIO/oiio,micler/oiio,bdeluca/oiio,scott-wilson/oiio,lgritz/oiio,cwilling/oiio,YangYangTL/oiio,sambler/oiio,bdeluca/oiio,mcanthony/oiio,jeremyselan/oiio,sambler/oiio,scott-wilson/oiio,mcanthony/oiio,YangYangTL/oiio,micler/oiio,OpenImageIO/oiio,lgritz/oiio,lgritz/oiio,OpenImageIO/oiio,sambler/oiio,micler/oiio,cwilling/oiio,scott-wilson/oiio,bdeluca/oiio,jeremyselan/oiio,scott-wilson/oiio,mcanthony/oiio,lgritz/oiio,YangYangTL/oiio,OpenImageIO/oiio,jeremyselan/oiio,cwilling/oiio,cwilling/oiio,micler/oiio