gst/asfdemux/: Add some more GUIDs and make debug log more readable and easier to...

gst/asfdemux/: Add some more GUIDs and make debug log more readable and easier to follow when parsing the headers.

Original commit message from CVS:
* gst/asfdemux/asfheaders.c:
* gst/asfdemux/asfheaders.h:
* gst/asfdemux/gstasfdemux.c: (gst_asf_demux_identify_guid),
(gst_asf_demux_process_header), (gst_asf_demux_push_obj),
(gst_asf_demux_pop_obj), (gst_asf_demux_process_object),
(gst_asf_demux_change_state):
* gst/asfdemux/gstasfdemux.h:
Add some more GUIDs and make debug log more readable
and easier to follow when parsing the headers.