Multiple `from` annotations

[ZYJLiu]

Thanks for building and maintaining codehike! Awesome tool

Requesting ability to reference the separate sections of the same file using from annotation mentioned from discussions

```js
// from ./foo.js 1:3
// from ./foo.js 5:7
// from ./foo.js 10
```

[pomber]

Thanks. To clarify, the idea is to be able to import code from different files, and that may also be used to import multiple sections of one file.

```js
// from ./one.js 1:3
// from ./two.js 5:7
// from ./two.js 10
```

[pomber]

Fixed in #510