* gtk/gtkrc.h (gtk_rc_parse_string): new function.
* gtk/gtkrc.c: many functions adapted to use GScanner for scanning.
(gtk_rc_parse): use gtk_rc_parse_any for parsing.
(gtk_rc_parse_string): new function to support parsing from
strings, just calls gtk_rc_parse_any.
(gtk_rc_parse_any): new function using GScanner as lexer.
-timj