Show sample wxApp derived/inherited code when Project is selected

[KeyWorksRW]

Description:

If the Project file is selected, we could show a sample of a derived/inherited wxApp class in the matching language's derived/inherited panels. This code wouldn't be generated, but a user could copy and paste it into their project as a starting point if they haven't created their own derived wxApp class yet. We could also look at whether there is a child form based on wxFrame and call m_frame->Show() if there is one or ShowModal() if there is just a dialog.