* Add FeedsListBeforeActualize hook.
Closes#8650
Implement new hook to allow extensions to modify the list of feeds to actualize.
How to test the feature manually:
1. Add several feeds from a single site (e.g. reddit and YT).
2. Add feeds to other sites.
3. Add and enable the extension https://github.com/pe1uca/xExtension-Declumping
4. Call `php app/actualize_script.php` to update feeds with a different order.
A log like this one is needed to properly see the behavior.
```php
foreach ($feeds as $key => $value) {
syslog(LOG_INFO, "$key: {$value->name()} ({$value->url()})");
}
```
Sort in alphabetical order.
* Implement call to hook
* Remove duplicate return
* Fix PHPStan error
* Update documentation
* Sanitize hook response
* Markdown cleaning
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Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>
bca9a5586e