[AL] Core Package v1.5.7

• This release includes fixes for the issues on PHP 8.1 version:

Fatal error: During inheritance of ArrayObject: Uncaught ErrorException: [E_DEPRECATED] Return type of AddonsLab\Core\Xf2\Admin\FilterFormParams:ffsetGet($key)

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This version adds a compatibility function for XenForo 2.1 to check if an add-on is active or no and several minor changes.
Please apply if any of your products require this version.