Fixes / improvements found during testing

* Redundant "simulatorStatusChanged" signal in proxy
* invokeMethod for timer
* removed redundant this->buildNavigator(1)
* Shortcut in GUI
* comment in variant

src/blackmisc/variant.h

@@ -47,7 +47,7 @@ namespace BlackMisc
             static void registerMetadata()
             {
                 Private::MetaTypeHelper<Derived>::maybeRegisterMetaType();
-                //! \todo KB: What does this monster do? Please some comment
+                // Details: https://dev.vatsim-germany.org/issues/413#note-6
                 [](...){}((qRegisterMetaType<AdditionalTypes>(), qDBusRegisterMetaType<AdditionalTypes>(), 0)...);
             }