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/qt4projectmanager/wizards/html5appwizard.cpp

@@ -39,6 +39,7 @@
 #include "qt4projectmanagerconstants.h"
 
 #include <projectexplorer/projectexplorerconstants.h>
+#include <qtsupport/qtsupportconstants.h>
 #include <limits>
 
 #include <QtCore/QCoreApplication>
@@ -93,6 +94,11 @@ Html5AppWizard::~Html5AppWizard()
     delete d;
 }
 
+Core::FeatureSet Html5AppWizard::requiredFeatures() const
+{
+    return Core::Feature(QtSupport::Constants::FEATURE_GENERIC_CPP_ENTRY_POINT);
+}
+
 Core::BaseFileWizardParameters Html5AppWizard::parameters()
 {
     Core::BaseFileWizardParameters parameters(ProjectWizard);