Aa-srp

> \[!NOTE\]
>
> **This version needs at least Alliance Auth v4.0.0b1!**
>
> Please make sure to update your Alliance Auth instance **before**
> you install this version, otherwise, an update to Alliance Auth will
> be pulled in unsupervised.

Added

- Compatibility to Alliance Auth v4
- Bootstrap 5
- Django 4.2
- Native lazy loading support for images

Changed

- JS modernized
- CSS modernizes
- Templates changed to Bootstrap 5
- Translations improved
- General code cleanup and modernization

Removed

- Compatibility to Alliance Auth v3

> \[!NOTE\]
>
> **This is the last version compatible with Alliance Auth v3.**

Added

- Setting for the loss value source \[153\]

Fixed

- Pluralisation in a template string

Changed

- German translation updated

Fixed

- Capitalization for translatable strings

Changed

- Use `clean_setting` function from `allianceauth-app-utils` instead of reinventing the
wheel and have our own
- Translations updated
- Test suite updated

Fixed

- Exception: 'NoneType' object has no attribute 'character_name' when opening the
Dashboard view, and in one of the displayed SRP links is a fleet commander who
doesn't exist anymore.

Fixed

- Catch `AttributeError` exception on migration from the AA built-in SRP module
- Don't create SRP requests for non-existent users on migration from AA built-in SRP
module

Changed

- Spanish translation improved
- Korean translation improved

Changed

- Discord notification handling moved to its own module
- Message generation for the SRP Team message simplified
- Using `SITE_URL` from `local.py`