shunt 0.1.0

Run multiple commands in single terminal with docker compose like logs.
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# Shunt

Have you ever wanted to run multiple commands in the same terminal, and have
Docker Compose style logs come out? Then this is the tool for you.

Configure the commands you want in a JSON (actually JSON5) file:

```json5
// dev.json
{
  commands: {
    ui: ["npm", "run", "dev"],
    backend: ["cargo", "run"],
  },
}
```

Run `gather dev.json` and see your output neatly woven together similar to
Docker Compose.

Each command is run in a pseudo-TTY if `gather` itself is run in a pseudo-TTY.
You can disable this with the `tty` option on a command:

```json
{
  "commands": {
    "example-command": {
      "argv": "./build.sh",
      "tty": "never"
    }
  }
}
```

`tty` can be `auto`, `never`, or `always`.

Environment substitution is not supported, you can add this support by calling
out to a shell:

```json5
{
  commands: {
    something: ["bash", "-c", "echo $PATH"],
  },
}
```

# TODO

- [ ] Add global option for colored prefixes (this wouldn't stop color from
      children).
- [ ] argv splitting option, eg just provide "echo hello".
- [ ] (maybe) be able to send input.