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feat(core): Zippers support @@girders-elements/children (#57, #51)

An element can include a property  `@@girders-elements/children` which denotes *which of it's properties contain children elements*. 

This is an optional property, and can contain:
- a *string* denoting a single property name, (e.g. `'@@girders-elements/children': 'children'`) 
- an *array of strings* denoting which properties contain child elements

*A property containing child elements* can either:
- contain a single element 
- contain an array of elements 

E.g.

```javascript
{
   kind: ['container', 'two-column'],
  '@@girders-elements/children': ['main', 'aside'],

  main: [
    { 
       kind: 'tile',
       content: [ ],
    },
    // ...
  ],
  aside: {
    kind: 'weather',
    content: [],
  }
}
```

This feature enhances the `zip.elementZipper`

188 of 252 branches covered (74.6%)

30 of 30 new or added lines in 2 files covered. (100.0%)

341 of 417 relevant lines covered (81.77%)

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