alexheretic/ab-av1 v0.4.4 on GitHub

Add crf-search, auto-encode, encode & vmaf command support for encoding images into avif.
This works in the same way as videos, example:
```
ab-av1 auto-encode -i pic.jpg
```
The default encoder svt-av1 has some dimension limitations which may cause this to fail. -e libaom-av1 also works and supports more dimensions.
Convert to yuv444p10le pixel format when calculating VMAF for accuracy and compatibility.
Update to clap v4 which changes help/about output & reduces binary size.
Print crf-search attempts even when stderr is not a tty.