gst/playback/gstdecodebin.c: Implement support for dynamic pad changing. We listen...

gst/playback/gstdecodebin.c: Implement support for dynamic pad changing. We listen to "live" pad removals (i.e. while...

Original commit message from CVS:
* gst/playback/gstdecodebin.c: (gst_decode_bin_class_init),
(get_unconnected_element), (remove_starting_from), (pad_removed),
(close_link):
Implement support for dynamic pad changing. We listen to "live"
pad removals (i.e. while playing) and re-setup autoplugging
after that. Playbasebin/playbin need some more work for this
to finally work, but decodebin supports (and replugs) chained
ogg now.