Added /presence command to show contacts presence

src/ui/ui.h

@@ -299,6 +299,7 @@ void (*cons_flash_setting)(void);
 void (*cons_splash_setting)(void);
 void (*cons_vercheck_setting)(void);
 void (*cons_occupants_setting)(void);
+void (*cons_presence_setting)(void);
 void (*cons_mouse_setting)(void);
 void (*cons_statuses_setting)(void);
 void (*cons_titlebar_setting)(void);