- Replacing alpha with QPainter SetOpactity (much faster)
- Fixing get_file_extension to not crash with filepaths that do no contain a "."
- Removing render hints from apply_background (since no transform or text rendering), making compositing (faster in certain cases)
- Optionally adding SmoothPixmapTransform based on a valid transform (faster in certain cases)
- Skip Opacity for fully opaque clips
- New Clip unit tests to validate new functionality