Aa-timezones

Added

- Deprecation warning when the `!time` command is used, advising to use `/time` instead

Fixed

- "Method could be a function" warning

Added

- Cog for `allianceauth-discordbot` to implement the `/time` command for Discord
- **Advice:** Please make sure `aadiscordbot` is listed _before_ `timezones` in
`INSTALLED_APPS` in your `local.py` to prevent an error from spawning in your
log file. It will still work, but the error is annoying and might cause
unnecessary questions in the Alliance Auth support Discord.
- `pytz` to dependencies. Can't rely on other packages for dragging it in

Changed

- JS modernized (Part 2)
- Management command for the initial timezones imports optimised

Added

- Test suite for AA 3.x and Django 4

Changed

- Switched to `setup.cfg` as config file, since `setup.py` is deprecated now

Removed

- Deprecated settings

Fixed

- \[Compatibility\] AA 3.x / Django 4 :: ImportError: cannot import name
'ugettext_lazy' from 'django.utils.translation'

Changed

- Using `path` in URL config instead of soon-to-be removed `url`

Changed

- JavaScript: `const` instead of `let` where ever appropriate