Add /inputwin top|bottom command

closes #853

tests/unittests/ui/stub_ui.c

@@ -445,6 +445,7 @@ void cons_reconnect_setting(void) {}
 void cons_autoping_setting(void) {}
 void cons_autoconnect_setting(void) {}
 void cons_inpblock_setting(void) {}
+void cons_inputwin_setting(void) {}
 void cons_tray_setting(void) {}
 
 void cons_show_contact_online(PContact contact, Resource *resource, GDateTime *last_activity)