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/genericprojectmanager/genericprojectwizard.cpp

@@ -116,6 +116,11 @@ GenericProjectWizard::GenericProjectWizard()
 GenericProjectWizard::~GenericProjectWizard()
 { }
 
+Core::FeatureSet GenericProjectWizard::requiredFeatures() const
+{
+    return Core::FeatureSet();
+}
+
 Core::BaseFileWizardParameters GenericProjectWizard::parameters()
 {
     Core::BaseFileWizardParameters parameters(ProjectWizard);