Add 8 bit formats to metadata output formatting.
Add 8 bit formats to metadata output formatting.

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