gst/gstregistrybinary.*: use glib types, cleanup comments, impement interfaces and...

gst/gstregistrybinary.*: use glib types, cleanup comments, impement interfaces and uri-types

Original commit message from CVS:
* gst/gstregistrybinary.c: (gst_registry_binary_write),
(gst_registry_binary_initialize_magic),
(gst_registry_binary_save_string), (gst_registry_binary_make_data),
(gst_registry_binary_save_pad_template),
(gst_registry_binary_save_feature),
(gst_registry_binary_save_plugin),
(gst_registry_binary_write_cache),
(gst_registry_binary_check_magic),
(gst_registry_binary_load_pad_template),
(gst_registry_binary_load_feature),
(gst_registry_binary_load_plugin),
(gst_registry_binary_read_cache):
* gst/gstregistrybinary.h:
use glib types, cleanup comments, impement interfaces and uri-types