Minify wgsl strings

Possible tools, find if there are more:

```
npm install miniray
npx miniray shader.wgsl -o shader.min.wgsl
```

```
cargo install --features 'bin' wgsl-minifier
wgsl-minifier path/to/shader.wgsl path/to/output.min.wgsl
```

```
washi minify-multiple --map *.wgsl
```

Careful of renaming internal functions, uniforms, constants and storages.