25409 Replace features

This is a WIP PR. It SHOULD NOT be merged.

This PR demonstrates the use of Fabricator to build content types (and views and other exportables). As it is not a complete PR, once you have run phing build, enable:
* aGov components for Fabricator
* Fabricator UI

You can now visit Admin > Structure > Fabricator, and Install the single Standard Page component.

You should get a new Standard Page ("agov_page") content type with three fields. There is a small bug where the field names are wrong.

The capability exists to install these programmatically, without the UI module. From a module install hook, for example, you would call:

```
\Drupal\fabricator\Fabricator::init()->make($blueprint_name, 'install');
```