ext/vorbis/: Add new vorbistag element which derives from vorbisparse and is essentia...

ext/vorbis/: Add new vorbistag element which derives from vorbisparse and is essentially the same as well, only that ...

Original commit message from CVS:
Patch by: James "Doc" Livingston <doclivingston at gmail com>
* ext/vorbis/Makefile.am:
* ext/vorbis/vorbis.c: (plugin_init):
* ext/vorbis/vorbisparse.c: (gst_vorbis_parse_class_init),
(vorbis_parse_parse_packet), (vorbis_parse_chain):
* ext/vorbis/vorbisparse.h:
* ext/vorbis/vorbistag.c: (gst_vorbis_tag_base_init),
(gst_vorbis_tag_class_init), (gst_vorbis_tag_init),
(gst_vorbis_tag_parse_packet):
* ext/vorbis/vorbistag.h:
Add new vorbistag element which derives from vorbisparse
and is essentially the same as well, only that it implements
the GstTagSetter interface and can modify the stream's
vorbiscomment on the fly (#335635).
* tests/check/Makefile.am:
* tests/check/elements/.cvsignore:
* tests/check/elements/vorbistag.c: (setup_vorbistag),
(cleanup_vorbistag), (buffer_probe), (start_pipeline),
(get_buffer), (stop_pipeline), (_create_codebook_header_buffer),
(_create_audio_buffer), (GST_START_TEST), (vorbistag_suite):
Add unit test for new vorbistag element.