Move help manager into core.

- lessens open file handles
 - improves help plugin startup further

Task-number: QTCREATORBUG-337
Reviewed-by: ck

src/plugins/qmljseditor/qmljshoverhandler.h

@@ -35,7 +35,6 @@
 #include <QtCore/QObject>
 
 QT_BEGIN_NAMESPACE
-class QHelpEngineCore;
 class QPoint;
 class QStringList;
 QT_END_NAMESPACE
@@ -80,10 +79,8 @@ private:
 
 private:
     ModelManagerInterface *m_modelManager;
-    QHelpEngineCore *m_helpEngine;
     QString m_helpId;
     QString m_toolTip;
-    bool m_helpEngineNeedsSetup;
 };
 
 } // namespace Internal