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/artprov.h

@@ -236,7 +236,7 @@ private:
     // art resources cache (so that CreateXXX is not called that often):
     static wxArtProviderCache *sm_cache;
 
-    DECLARE_ABSTRACT_CLASS(wxArtProvider)
+    wxDECLARE_ABSTRACT_CLASS(wxArtProvider);
 };