Add an OFA element, the successor of MusicBrainz TRM fingerprinting.

Add an OFA element, the successor of MusicBrainz TRM fingerprinting.

Original commit message from CVS:
Based on a patch by: Eric Buehl <eric dot buehl at gmail dot com>
* configure.ac:
* ext/ofa/Makefile.am:
* ext/ofa/gstofa.c: (gst_ofa_base_init), (gst_ofa_finalize),
(gst_ofa_class_init), (create_fingerprint), (gst_ofa_event),
(gst_ofa_init), (gst_ofa_transform_ip), (gst_ofa_get_property),
(plugin_init):
* ext/ofa/gstofa.h:
Add an OFA element, the successor of MusicBrainz TRM fingerprinting.
Fixes bug #351309.