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/valgen.h

@@ -85,7 +85,7 @@ protected:
     double*     m_pDouble;
 
 private:
-    DECLARE_CLASS(wxGenericValidator)
+    wxDECLARE_CLASS(wxGenericValidator);
     wxDECLARE_NO_ASSIGN_CLASS(wxGenericValidator);
 };