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/osx/dcscreen.h

@@ -25,7 +25,7 @@ private:
     void* m_overlayWindow;
 
 private:
-    DECLARE_CLASS(wxScreenDCImpl)
+    wxDECLARE_CLASS(wxScreenDCImpl);
     wxDECLARE_NO_COPY_CLASS(wxScreenDCImpl);
 };