update description and other project metadata

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

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@75496 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
remove “-src” from the source tarball name so it matches what setuptools and pip expect it to be.

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@75497 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
add standard file header

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@75498 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775