Improve build and widget storage

There are no longer any qt headers included in wx/qt headers.
Applications do not need to link with qt librarys anymore, only wxqt libraries.
wxWindow and derived widgets only contain one pointer to their qtwidget, no longer
  carrying both base and derived pointers in parallel as was before.

include/wx/qt/private/timer.h

@@ -0,0 +1,39 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/qt/timer.h
+// Author:      Javier Torres
+// Copyright:   (c) Javier Torres
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_QT_TIMER_H_
+#define _WX_QT_TIMER_H_
+
+#if wxUSE_TIMER
+
+#include <QtCore/QObject>
+#include "wx/private/timer.h"
+
+//-----------------------------------------------------------------------------
+// wxTimer
+//-----------------------------------------------------------------------------
+
+class QTimerEvent;
+class WXDLLIMPEXP_CORE wxQtTimerImpl : public wxTimerImpl, QObject
+{
+public:
+    wxQtTimerImpl( wxTimer* timer );
+
+    virtual bool Start( int millisecs = -1, bool oneShot = false );
+    virtual void Stop();
+    virtual bool IsRunning() const;
+
+protected:
+    virtual void timerEvent( QTimerEvent * event );
+    
+private:
+    int m_timerId;
+};
+
+#endif // wxUSE_TIMER
+
+#endif // _WX_QT_TIMER_H_