Added filter.h to public headers
Added filter.h to public headers

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