QmlProject: Move project tree generation out of the ProjectNodes

Change-Id: Ic0dbd0762f92191ee7d7eac47cb5385e1d3b9575
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmlprojectmanager/qmlprojectnodes.h

@@ -46,8 +46,6 @@ public:
     virtual bool deleteFiles(const QStringList &filePaths) override;
     virtual bool renameFile(const QString &filePath, const QString &newFilePath) override;
 
-    void refresh();
-
 private:
     QmlProject *m_project;
 };