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/imagpcx.h

@@ -36,7 +36,7 @@ protected:
 #endif // wxUSE_STREAMS
 
 private:
-    DECLARE_DYNAMIC_CLASS(wxPCXHandler)
+    wxDECLARE_DYNAMIC_CLASS(wxPCXHandler);
 };
 #endif // wxUSE_PCX