There is currently a private method inside of html.parser.HTMLParser to
unescape HTML &...; style escapes. This would be useful to expose for
other users who want to unescape a piece of HTML.
Additionally, many websites don't use proper unicode or iso-8859-1
encodings and accidentally use Microsoft Code Page 1252 extensions. I
added code to map these to their appropriate unicode values.
The unescaping logic was slightly simplified too.
This is my first Python patch submission, so please let me know if I've
done anything wrong.
A new test case was also added for this functionality.