* Simplify URL and view structure. Add support for multiple PK types
based on URL pattern as well as natural key support via URL patterns.
* Remove `django-compat` dependency.
* Drop special case handling for unsupported Python/Django versions.
* Deprecate `HIJACK_URL_ALLOWED_ATTRIBUTES` setting favoring `HIJACK_USER_URL_PATTERN`.
* Deprecate URL names `login_with_id`, `login_with_username` and `login_with_email` favoring `acquire`.
* Deprecate URL name `release_hijack` favoring `release`.
* Deprecate views `login_with_id`, `login_with_username` and `login_with_email` favoring `release_user_view`.
* Deprecate view `release_hijack` favoring `release_user_view`.
* Reformat code and imports (black/isort).
* Remove old change log file from repo and distributions.