Make wxQtWidget helper internal (remove header)
Move helper template to private and rename last _qt.h

--HG--
rename : include/wx/qt/pointer_qt.h => include/wx/qt/pointer.h
rename : include/wx/qt/winevent_qt.h => include/wx/qt/private/winevent.h
Refactor menu item (wxQtAction) to make it a thin helper
Remove private include (helper) from wxQT headers