APE v1/2 tag reader plus typefind function.

APE v1/2 tag reader plus typefind function.

Original commit message from CVS:
* configure.ac:
* gst/apetag/Makefile.am:
* gst/apetag/apedemux.c: (gst_ape_demux_get_type),
(gst_ape_demux_base_init), (gst_ape_demux_class_init),
(gst_ape_demux_init), (gst_ape_demux_get_src_formats),
(gst_ape_demux_get_src_query_types),
(gst_ape_demux_handle_src_query), (gst_ape_demux_get_event_mask),
(gst_ape_demux_handle_src_event), (gst_ape_demux_handle_event),
(gst_ape_demux_typefind_peek), (gst_ape_demux_typefind_get_length),
(gst_ape_demux_typefind_suggest), (gst_ape_demux_typefind),
(gst_ape_demux_parse_tags), (gst_ape_demux_stream_init),
(gst_ape_demux_stream_data), (gst_ape_demux_loop),
(gst_ape_demux_change_state):
* gst/apetag/apedemux.h:
* gst/apetag/apetag.c: (plugin_init):
* gst/typefind/gsttypefindfunctions.c: (apetag_type_find),
(plugin_init):
APE v1/2 tag reader plus typefind function.