Django-mfa3

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- Fix packaging: include templatetags

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- Fix packaging: exclude tests

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- Convert qrcode to template filter. In templates, change
`{{ mfa_data.qrcode|safe }}` to `{% load mfa %} {{ mfa_data.url|qrcode }}`.
- Fix form validation on missing code
- Add german translation
- Use `never_cache` and `sensitive_post_parameters` decorators
- Do not generate a new challenge on validation errors

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- Trigger `user_login_failed` on failed second factor. This can be used to
integrating with external rate limiting solutions such as django-axes.
- Fix: include JS files in python package
- Render qrcode server-side
- Convenience: redirect to TOTP auth if no FIDO2 key exists
- Add optional `MFAEnforceMiddleware`
- Tweak admin UI
- Tweak example templates

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initial release