Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstbin.c: (gst_bin_class_init), (gst_bin_init),
(gst_bin_dispose), (gst_bin_set_property), (gst_bin_get_property),
(gst_bin_remove_func), (gst_bin_handle_message_func):
* gst/gstbin.h:
Add a property for bins that handle the state change of their childs.
Fixes #435880