Add internal helpers for pre-registering quarks from static strings and using the...

Add internal helpers for pre-registering quarks from static strings and using the quark values directly instead of lo...

Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/Makefile.am:
* gst/gst.c: (init_post):
* gst/gst_private.h:
* gst/gstquark.c: (_priv_gst_quarks_initialize):
* gst/gstquark.h:
* gst/gstquery.c: (gst_query_new_position),
(gst_query_set_position), (gst_query_parse_position),
(gst_query_new_duration), (gst_query_set_duration),
(gst_query_parse_duration), (gst_query_new_convert),
(gst_query_set_convert), (gst_query_parse_convert),
(gst_query_new_segment), (gst_query_set_segment),
(gst_query_parse_segment), (gst_query_new_seeking),
(gst_query_set_seeking), (gst_query_parse_seeking):
Add internal helpers for pre-registering quarks from static strings
and using the quark values directly instead of looking them up when
creating and parsing queries. Can be used for event construction too.
Closes #350432.