Change in wxWindow the access specifier of the wxEvtHandler event processing and queuing functions

from public to protected. Adapt wxWidgets code and wxWidgets samples to always use wxWindow::GetEventHandler()
when calling such functions on a wxWindow rather than directly using wxWindow::ProcessEvent, etc.
This enables correct event dispatching to the event handlers which have been pushed (with PushEventHandler) on the 
windows.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58381 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/mdig.h

@@ -78,8 +78,6 @@ public:
     virtual void SetMenuBar(wxMenuBar *pMenuBar);
 #endif // wxUSE_MENUS
 
-    virtual bool ProcessEvent(wxEvent& event);
-
     virtual wxGenericMDIClientWindow *OnCreateGenericClient();
 
 
@@ -112,6 +110,8 @@ private:
     void OnWindowMenu(wxCommandEvent& event);
 #endif // wxUSE_MENUS
 
+    virtual bool ProcessEvent(wxEvent& event);
+
     void OnClose(wxCloseEvent& event);
 
     // return the client window, may be NULL if we hadn't been created yet