Wizards: Add a command to trigger a reload of all wizards

This will make the custom and the json wizard scan for their files
the next time all wizards are requested.

Change-Id: Ibe1ed3f838d1c177e9bbf91ed0eae49028f671cd
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/coreplugin/iwizardfactory.cpp

@@ -341,4 +341,9 @@ FeatureSet IWizardFactory::pluginFeatures() const
 void IWizardFactory::initialize()
 {
     connect(ICore::instance(), &ICore::coreAboutToClose, &IWizardFactory::clearWizardFactories);
+
+    auto resetAction = new QAction(tr("Reload All Wizards"), ActionManager::instance());
+    ActionManager::registerAction(resetAction, "Wizard.Factory.Reset");
+
+    connect(resetAction, &QAction::triggered, &IWizardFactory::clearWizardFactories);
 }