Support for surrogate pairs in json string.
Support for surrogate pairs in json string.

https://bugzilla.gnome.org/show_bug.cgi?id=615799

Signed-off-by: Emmanuele Bassi <049ee2061f71220e5aaf33f5be422fc2a2b06a44@linux.intel.com>

Distrotech/json-glib,Distrotech/json-glib,ebassi/json-glib,brauliobo/json-glib,oerdnj/json-glib,ebassi/json-glib,oerdnj/json-glib,brauliobo/json-glib,robtaylor/json-glib-gvariant,robtaylor/json-glib-gvariant,brauliobo/json-glib,GNOME/json-glib,frida/json-glib,Distrotech/json-glib,frida/json-glib,oerdnj/json-glib,oerdnj/json-glib,GNOME/json-glib,ebassi/json-glib