Updated the camerabin2 based camera with QtMultimedia changes

Moved it to the separate plugin as the rest of gstreamer based services;
Updated with libqgsttools_p changes;
Implemented QMediaRecorder::status property;
Made gst_photography dependency optional,
it's not always available on desktop;
Added video recording case to auto integration test;
Moved backend implementation into qt namespace

Task-number: QTBUG-26046
Change-Id: Iacfc1a6e263a4c0201d5eb28d04c960b87a230c0
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/gstreamer/camerabin/camerabinmetadata.cpp

@@ -44,6 +44,8 @@
 #include <gst/gst.h>
 #include <gst/gstversion.h>
 
+QT_BEGIN_NAMESPACE
+
 struct QGstreamerMetaDataKeyLookup
 {
     QString key;
@@ -175,3 +177,5 @@ QStringList CameraBinMetaData::availableMetaData() const
 
     return res;
 }
+
+QT_END_NAMESPACE