adding GDP payloader and depayloader. Build integration will follow later when the...

adding GDP payloader and depayloader.  Build integration will follow later when the GDP issues for core are sorted out.

Original commit message from CVS:
* gst/gdp/Makefile.am:
* gst/gdp/gstgdp.c: (plugin_init):
* gst/gdp/gstgdpdepay.c: (gst_gdp_depay_base_init),
(gst_gdp_depay_class_init), (gst_gdp_depay_init),
(gst_gdp_depay_finalize), (gst_gdp_depay_chain),
(gst_gdp_depay_change_state), (gst_gdp_depay_plugin_init):
* gst/gdp/gstgdpdepay.h:
* gst/gdp/gstgdppay.c: (gst_gdp_pay_base_init),
(gst_gdp_pay_class_init), (gst_gdp_pay_init),
(gst_gdp_pay_dispose), (gst_gdp_stamp_buffer),
(gst_gdp_buffer_from_caps), (gst_gdp_pay_buffer_from_buffer),
(gst_gdp_buffer_from_event), (gst_gdp_pay_reset_streamheader),
(gst_gdp_queue_buffer), (gst_gdp_pay_chain),
(gst_gdp_pay_sink_event), (gst_gdp_pay_change_state),
(gst_gdp_pay_plugin_init):
* gst/gdp/gstgdppay.h:
* tests/check/Makefile.am:
* tests/check/elements/gdpdepay.c: (setup_gdpdepay),
(cleanup_gdpdepay), (gdpdepay_push_per_byte), (GST_START_TEST),
(setup_gdpdepay_streamheader), (gdpdepay_suite), (main):
* tests/check/elements/gdppay.c: (setup_gdppay), (cleanup_gdppay),
(GST_START_TEST), (setup_gdppay_streamheader), (gdppay_suite),
(main):
adding GDP payloader and depayloader.  Build integration will
follow later when the GDP issues for core are sorted out.