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/generic/headerctrlg.h

@@ -173,7 +173,7 @@ private:
     wxArrayInt m_colIndices;
 
 
-    DECLARE_EVENT_TABLE()
+    wxDECLARE_EVENT_TABLE();
     wxDECLARE_NO_COPY_CLASS(wxHeaderCtrl);
 };