* Add wxStaticBoxSizer
* Add the AddMany and other convenience methods from Classic
* properly handle the userData args for the sizer methods too
* some refactoring
* Add unittests
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@69624 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775