Original commit message from CVS: * ext/celt/gstceltenc.c: * ext/celt/gstceltenc.h: * ext/metadata/gstmetadatamux.c: * gst/qtmux/gstqtmux.c: * gst/qtmux/gstqtmux.h: Totally remove the internal taglists and fully use tagsetter. Fixes various tag muxing issues.