1. deprecate redundantly sounding wxArtProvider::FooProvider() to just Foo()

2. wxArtProvider::Remove() now really only removes the provider without
   deleting it, Delete() does delete it
3. moreover, ~wxArtProvider removes the provider as well so there is almost
   no need to call Delete() explicitly any more


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41398 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/artprov/arttest.cpp

@@ -216,7 +216,7 @@ void MyFrame::OnBrowser(wxCommandEvent& WXUNUSED(event))
 void MyFrame::OnPlugProvider(wxCommandEvent& event)
 {
     if ( event.IsChecked() )
-        wxArtProvider::PushProvider(new MyArtProvider);
+        wxArtProvider::Push(new MyArtProvider);
     else
-        wxArtProvider::PopProvider();
+        wxArtProvider::Pop();
 }