gst/qtdemux/qtdemux.c: Reorganise some stuff.

gst/qtdemux/qtdemux.c: Reorganise some stuff.

Original commit message from CVS:
* gst/qtdemux/qtdemux.c: (gst_qtdemux_init),
(gst_qtdemux_push_event), (gst_qtdemux_do_seek),
(gst_qtdemux_change_state), (extract_initial_length_and_fourcc),
(gst_qtdemux_loop_state_header), (gst_qtdemux_activate_segment),
(gst_qtdemux_loop_state_movie), (gst_qtdemux_loop),
(gst_qtdemux_post_buffering), (gst_qtdemux_chain),
(gst_qtdemux_add_stream), (qtdemux_process_redirects),
(qtdemux_parse_tree), (qtdemux_parse_trak):
Reorganise some stuff.
Parse RTSP redirection URLS.