win32: made a workaround for the redraw problem in GTK+ 2.10.11.
separated UI code from prefs.c.
added wrappers for C library function that take pathname arguments.
made the order of buttons comply with GNOME HIG.
fixed Turkish locale problem.
replaced intl.h with glib/gi18n.h.
use GTK stock button for button set.
Initial import of Sylpheed (GTK2 version).