New camera viewfinder settings API.

There already was a control interface for the viewfinder settings
but no real public C++ API and a partial QML API.

This patch adds a new C++ API and improves the QML API.

Supported viewfinder settings are resolution, minimumFrameRate,
maximumFrameRate and pixelFormat. The camera can be queried for
the supported values for each of these settings.

A new control interface was created to match the new API.

Change-Id: I289fea038fe46277a5516c956a64280da09ed985
Reviewed-by: Andrew den Exter <andrew.den.exter@qinetic.com.au>

src/imports/multimedia/qdeclarativecameraviewfinder_p.h

@@ -78,9 +78,12 @@ Q_SIGNALS:
     void minimumFrameRateChanged();
     void maximumFrameRateChanged();
 
+private Q_SLOTS:
+    void _q_cameraStatusChanged(QCamera::Status status);
+
 private:
     QCamera *m_camera;
-    QCameraViewfinderSettingsControl *m_control;
+    QCameraViewfinderSettings m_settings;
 };
 
 QT_END_NAMESPACE