videoclean third-party attribution

This project can use PP-OCRv5 detector weights derived from PaddleOCR.

PP-OCRv5 detector weights
Copyright (c) PaddlePaddle Authors
Licensed under the Apache License, Version 2.0.

The detector weight is distributed separately from videoclean's GPLv3 source.
See PROVENANCE.md and LICENSE-APACHE-2.0 for attribution and license terms.