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/opengl/penguin/penguin.cpp

@@ -60,7 +60,7 @@ bool MyApp::OnInit()
     return true;
 }
 
-IMPLEMENT_APP(MyApp)
+wxIMPLEMENT_APP(MyApp);
 
 // ---------------------------------------------------------------------------
 // MyFrame