Compare_entities diff uses id instead of name where needed

See merge request !165

BUG: The diff returned by compare_entities now uses id instead of name as key if either of the compared properties do not have a name

WIP: Modernizing setup.

See merge request !163

Prevent auth_token from being overwritten with None

See merge request !162

Fix mypy errors

See merge request !164

Remove noscript and benchmark tags from to_xml output

See merge request !161

BUG: to_xml now also filters out TransactionBenchmark tags, root being noscript or TransactionBenchmark does not cause error

TST: Added support for logout to MockUpServerConnection and tests to fix test_auth_token_connection in test_connection.py

BUG: Request responses without the "Set-Cookie" header no longer overwrite the current auth_token with None