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/helpbase.h

@@ -96,7 +96,7 @@ public:
 protected:
     wxWindow* m_parentWindow;
 private:
-    DECLARE_CLASS(wxHelpControllerBase)
+    wxDECLARE_CLASS(wxHelpControllerBase);
 };
 
 #endif // wxUSE_HELP