projectblacklight / blacklight / 4801

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Make the component configuration additive

Hopefully this makes it easier to understand how to customize the
components.

This is done by having all the component configuration generated onto
the template CatalogController rather than having it included in a mixin
automatically.

For backwards compatibility people will have to mix in:
```
include Blacklight::DefaultComponentConfiguration
```

or add to CatalogController:

```
  configure_blacklight do |config|
    config.add_results_document_tool(:bookmark, partial: 'bookmark_control', if: :render_bookmarks_control?)

    config.add_results_collection_tool(:sort_widget)
    config.add_results_collection_tool(:per_page_widget)
    config.add_results_collection_tool(:view_type_group)

    config.add_show_tools_partial(:bookmark, partial: 'bookmark_control', if: :render_bookmarks_control?)
    config.add_show_tools_partial(:email, callback: :email_action, validator: :validate_email_params)
    config.add_show_tools_partial(:sms, if: :render_sms_action?, callback: :sms_action, validator: :validate_sms_params)
    config.add_show_tools_partial(:citation)

    config.add_nav_action(:bookmark, partial: 'blacklight/nav/bookmark', if: :render_bookmarks_control?)
    config.add_nav_action(:search_history, partial: 'blacklight/nav/search_history')
  end

```

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