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dash: Don't use sscanf + glib format modifiers

Nirbheek Chauhan requested to merge nirbheek/gst-plugins-bad:fix-glib-248-compat into master

We do not have a way to know the format modifiers to use with string functions provided by the system. G_GUINT64_FORMAT and other string modifiers only work for glib string formatting functions. We cannot use them for string functions provided by the stdlib. See: https://developer.gnome.org/glib/stable/glib-Basic-Types.html#glib-Basic-Types.description

F.ex.

 ../ext/dash/gstxmlhelper.c: In function 'gst_xml_helper_get_prop_unsigned_integer_64':
../ext/dash/gstxmlhelper.c:473:40: error: unknown conversion type character 'l' in format [-Werror=format=]
     if (sscanf ((gchar *) prop_string, "%" G_GUINT64_FORMAT,
                                        ^~~
In file included from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86/include/glib-2.0/glib/gtypes.h:32,
                 from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86/include/glib-2.0/glib/galloca.h:32,
                 from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86/include/glib-2.0/glib.h:30,
                 from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86/include/gstreamer-1.0/gst/gst.h:27,
                 from ../ext/dash/gstxmlhelper.h:26,
                 from ../ext/dash/gstxmlhelper.c:22:
/builds/nirbheek/cerbero/cerbero-build/dist/windows_x86/lib/glib-2.0/include/glibconfig.h:69:28: note: format string is defined here
 #define G_GUINT64_FORMAT "llu"
                            ^
../ext/dash/gstxmlhelper.c:473:40: error: too many arguments for format [-Werror=format-extra-args]
     if (sscanf ((gchar *) prop_string, "%" G_GUINT64_FORMAT,
                                        ^~~

In the process, we're also following the DASH MPD spec more closely now, which specifies that ranges must follow RFC 2616 section 14.35.1: https://tools.ietf.org/html/rfc2616#page-138

Needed for cerbero!419 (merged)

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