Show OTR coloured status

Customisable within theme files e.g.:
titlebar.unencrypted=red
titlebar.encrypted=green
titlebar.trusted=red
titlebar.untrusted=green

Shows [unencrypted] for all non-OTR chat

Disable with '/otr warn off'

src/ui/ui.h

@@ -221,6 +221,7 @@ void (*cons_log_setting)(void);
 void (*cons_chlog_setting)(void);
 void (*cons_grlog_setting)(void);
 void (*cons_otr_log_setting)(void);
+void (*cons_otrwarn_setting)(void);
 void (*cons_autoaway_setting)(void);
 void (*cons_reconnect_setting)(void);
 void (*cons_autoping_setting)(void);