Bug fixes
- Fix `lark` (1744a70)
Improvements
- Add alpha blending support for blend modes (2adbca5, 8002366, 09d5829)
- Add more blend modes (b2bafab)
- `darken`, `difference`, `lighten`, `multiply`, `normal`, `screen`,
- Improve `hard_light` performance (7f9c54f)
- Improve `soft_light` performance (db3a865, 05ee8f0)