Copy the wxPython demo from Classic

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74164 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
The dllwidget no longer exists so get rid of this old crusty demo code.

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74165 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775