update description and other project metadata

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75495 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add support for building a Python wheel distribution.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75496 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775