QmlJSInspector: Query Objects Iteratively

Currently all objects are recursively fetched when the root context
is retrieved. This patch fetches objects on demand.

Change-Id: Idf5c621ec38869dd5a676116bc4df528d7bb2fda
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmljsinspector/qmljsclientproxy.h

@@ -93,6 +93,9 @@ public:
 
     Debugger::QmlAdapter *qmlAdapter() const;
 
+    quint32 fetchContextObject(const QmlDebugObjectReference& obj);
+    void addObjectToTree(const QmlDebugObjectReference &obj);
+
 signals:
     void objectTreeUpdated();
     void connectionStatusMessage(const QString &text);