Wizards: allows filtering of wizards based on Qt version

Every wizard now implements requiredFeatures() to define a feature set.
If the feature set is not satisfied by the available Qt Versions,
the wizard is not shown in the create file/project dialog.

Every Qt version can define the provided feature set in availableFeatures()
defined in BaseQtVersion.

Change-Id: Ie9e2c210d19187b2296451948c36d274f2096623
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>
Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>

src/plugins/designer/formwizard.cpp

@@ -34,6 +34,7 @@
 #include "formwizarddialog.h"
 #include "formwindoweditor.h"
 #include "designerconstants.h"
+#include <qtsupport/qtsupportconstants.h>
 
 #include <QtCore/QDebug>
 
@@ -45,6 +46,11 @@ FormWizard::FormWizard(const BaseFileWizardParameters &parameters, QObject *pare
 {
 }
 
+Core::FeatureSet FormWizard::requiredFeatures() const
+{
+    return Core::Feature(QtSupport::Constants::FEATURE_QWIDGETS);
+}
+
 QWizard *FormWizard::createWizardDialog(QWidget *parent,
                                         const QString &defaultPath,
                                         const WizardPageList &extensionPages) const