issue2551167 - update wheel support. New method for finding locale and template files when installed as a wheel. It acts more like existing code for egg support. Add build-arg source=local_pip for building using pip using the local files rather than downloading from pypi. Useful for testing these changes. Since it's developer testing code and still has the downside that man pages aren't accessible, I am not documenting it as an option.

# human timezones
pytz
# indexer
Whoosh
# extra database support
psycopg2
mysqlclient
# encryption
gpg
# java web tokens
PyJWT
# extra HTTP compression methods
Brotli
zstd