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/msw/dcscreen.h

@@ -25,7 +25,7 @@ public:
         GetDeviceSize(w, h);
     }
 
-    DECLARE_CLASS(wxScreenDCImpl)
+    wxDECLARE_CLASS(wxScreenDCImpl);
     wxDECLARE_NO_COPY_CLASS(wxScreenDCImpl);
 };