v3.0.0

This is a huge release for odiff, it became faster than ever! Here is what's changed:

## Changes

**Breaking** algorithm changes — some images can produce different diff 
- Improved our main algorithm implementation leading to fewer false positives around semi-transparent colors, resolved an issue with different encodings of fully transparent color, and now different color spaces for tiff images 
- odiff became even faster, 3-4 times faster than the 2.x releases at a cost of slightly larger memory usage. Get back to the previous memory usage with `--reduce-ram-usage` flag
- Sources rewritten to pure OCaml 🐫
- Improved the way encoder libraries are linked leading to the smaller binary files and significantly lighter npm package size