Issue: Use XF imageManager for image manipulation tasks on Xenforo

src/addons/vw/vw/_core/model/image/format/vw.php

        $imageManager = \XF::app()->imageManager();
        $canResize = $imageManager->canResize($attachment->width, $attachment->height);
        if (!$canResize) {
            return;
        }
        $limit = \XF::options()->attachmentMaxDimensions;
        $maxWidth = $limit['width'];
        $maxHeight = $limit['height'];

        $oldPath = $attachment->getAbstractedDataPath();
        $resizeTempFile = File::copyAbstractedPathToTempFile($oldPath);   // XF\Util\File;
        $image = $imageManager->imageFromFile($resizeTempFile);
        if (!$image) {
            return;
        }
        $image->resize($maxWidth ?: $maxHeight, $maxHeight ?: null);
        $image->save($resizeTempFile);

        $db = $attachment->db();
        $db->beginTransaction();
        $file = new FileWrapper($resizeTempFile);  // XF\FileWrapper;
        $attachment->file_size = $file->getFileSize() ?: 0;
        $attachment->file_hash = md5_file($resizeTempFile);
        $attachment->width = $image->getWidth();
        $attachment->height = $image->getHeight();
        $attachment->save();
        try {
            File::copyFileToAbstractedPath($resizeTempFile, $attachment->getAbstractedDataPath());
        } catch (\Exception $e) {
            $db->rollback();
            return;
        }
        $db->commit();
        File::deleteFromAbstractedPath($oldPath);