Use wx-prefixed macros throughout the repository.

Change {DECLARE,IMPLEMENT}_*CLASS and {DECLARE,BEGIN,END}_EVENT_TABLE
occurrences to use the wx-prefixed version of the macros.

include/wx/gtk/msgdlg.h

@@ -45,7 +45,7 @@ private:
     // changing the message between constructing the dialog and showing it
     void GTKCreateMsgDialog();
 
-    DECLARE_DYNAMIC_CLASS(wxMessageDialog)
+    wxDECLARE_DYNAMIC_CLASS(wxMessageDialog);
 };
 
 #endif // _WX_GTK_MSGDLG_H_