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.

samples/docview/docview.h

@@ -87,6 +87,6 @@ private:
     wxDECLARE_NO_COPY_CLASS(MyApp);
 };
 
-DECLARE_APP(MyApp)
+wxDECLARE_APP(MyApp);
 
 #endif // _WX_SAMPLES_DOCVIEW_DOCVIEW_H_