rustybuzz 0.20.1

A complete harfbuzz shaping algorithm port to Rust.
Documentation
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## Usage

```sh
python3 gen-universal-table.py > ../src/hb/ot_shaper_use_table.rs

python3 ./gen-vowel-constraints.py > ../src/complex/vowel_constraints.rs
rustfmt ../src/complex/vowel_constraints.rs
```