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Turn a struct into arguments for a [Command](https://doc.rust-lang.org/stable/std/process/struct.Command.html).

```rust
use argley::prelude::*;

#[derive(Args)]
struct Args<'a> {
  compress: bool,
  
  #[arg(rename = "dir")]
  output_dir: &'a Path,
  
  #[arg(variadic)]
  input_files: Vec<&'a Path>,
}

let args = Args {
  compress: true,
  output_dir: Path::new("./output"),
  input_files: vec![Path::new("./foo.txt"), Path::new("./bar.txt")],
};

let output = Command::new("some-application")
  .add_arg_set(&args)
  .output()
  .unwrap();
```

Support for [async-std](https://crates.io/crates/async-std) and [tokio](https://crates.io/crates/tokio) can be enabled
via their respective features.

See crate-level docs for detailed configuration options.