v0.4.2 -- Cleanup, maintenance and fixes

Features

• Remove six compatibility module.
• Remove Python 2 compatibility code.
• Remove specifying object inheritance in classes.
• Added Web UI listening on specific IP address.
• Added Python 3.11 compatibility.

Fixes

• Specified encoding on file write rather than assuming default encoding.
• Changed type of default_value from string to bytes for FromFile.
• s_update primitive was out of date.
• The minimum supported Python version is now 3.8.
• Removed duplicates from BitField primitive.
• Fixed unwanted deprecation warning when using Session.fuzz(name=name).
• Changed type of dep_value argument of Block to bytes and added type checks.
• Split sessions.py into multiple files.
• Using poetry as package build system.