Related: quiqqer/quiqqer#1354

The bulk upload returns the files that have been uploaded. in addition, the media controls take these into account. The FolderViewer now activates these files correctly

related: pcsg/kunden/froilein-adrett-template#126

Related: quiqqer/quiqqer#1343

Setting "QUIQQER_OTHER_AUTOLOADERS=KEEP" will keep other autoloaders.
This is required for tooling (e.g. PHPStan).

refactor: replace "$this->staticMethod" with "static::staticMethod"

See merge request quiqqer/quiqqer!146

Those classes should not use late static binding.

Related: quiqqer/quiqqer!146

Rector rule: ThisCallOnStaticMethodToStaticCallRector

Refactorings & Fixes based on PHPStan

See merge request quiqqer/quiqqer!118

This is the recommended way to prevent CI breaking on PHPStan updates

Call to an undefined method QUI\Permissions\Manager::removePermission()

Without that check calling $Parent->save() throws an error, if $Paren is not of type Edit

Previously variable $QUM might not be defined.
This would have happened, if the permission check threw a QUI\Exception