Add setConfigurationMap to ViewStep with empty implementation.

Actual module ViewSteps can reimplement it to read their own module-
specific configuration.

src/libcalamaresui/viewpages/ViewStep.cpp

@@ -46,4 +46,9 @@ void
 ViewStep::onLeave()
 {}
 
+
+void
+ViewStep::setConfigurationMap( const QVariantMap& configurationMap )
+{}
+
 }

src/libcalamaresui/viewpages/ViewStep.h

@@ -64,6 +64,8 @@ public:
 
     virtual QList< Calamares::job_ptr > jobs() const = 0;
 
+    virtual void setConfigurationMap( const QVariantMap& configurationMap );
+
 signals:
     void nextStatusChanged( bool status );
     void done();