win32: made a workaround for the redraw problem in GTK+ 2.10.11.
added Bcc: and Reply-To: to the template.
fixed focus problem in win32.
separated UI code from prefs_common.c and prefs_account.c.
made the order of buttons comply with GNOME HIG.
replaced intl.h with glib/gi18n.h.
use GTK stock button for alertpanel.
use GTK stock button for dialog button set.
Initial import of Sylpheed (GTK2 version).