Remove commented code and TODO comments

There are some TODO comments that are more helpful, but they should probably be moved to GitHub Issues.

```js
// @TODO move these into fixtures?
```
```js
* @TODO is `extendedData` used by any callers?
```

Also there is commented code that should be removed

```js
// Var config = require('./config');
```

And then there are these TODO comments 😭

```js
import { deepObj, resourceKey, resourceId } from './object'; // TODO NO NO NO NO
```

```js
if (!fieldData.hasOwnProperty('contents')) {
// TODO again
}
```

```js
import { deepCollection } from './object'; // TODO NOPE
```

All of these comments should be removed, and some of them should be moved into GitHub Issues.