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/coreplugin/dialogs/iwizard.cpp

@@ -35,6 +35,8 @@
 
 #include <extensionsystem/pluginmanager.h>
 
+#include <QtCore/QStringList>
+
 /*!
     \class Core::IWizard
     \mainclass
@@ -178,3 +180,14 @@ QList<IWizard*> IWizard::wizardsOfKind(WizardKind kind)
     return findWizards(WizardKindPredicate(kind));
 }
 
+bool IWizard::isAvailable() const
+{
+    FeatureSet availableFeatures;
+
+    const QList<Core::IFeatureProvider*> featureManagers = ExtensionSystem::PluginManager::instance()->getObjects<Core::IFeatureProvider>();
+
+    foreach (const Core::IFeatureProvider *featureManager, featureManagers)
+        availableFeatures |= featureManager->availableFeatures();
+
+    return availableFeatures.contains(requiredFeatures());
+}