typos

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@76355 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Adapt to Py3 changes in tokenizer, method & function attribute names, etc.
Some general cleanup too.

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@76356 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove completed TODO

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@76357 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775