Create a Nuxeo document picker

As a developer, a document picker element is available to me.

AC

• Element allows the user to select a document and returns it
• I can pick a document using a search
• Option is based on a page provider so that the results returned are configurable

Customization / Configuration

• I can create a search form layout / results listing layout and use that to override the search option
  • Configuration applies at a local level (per rich text editor instance, not global to every instance)
• A property is exposed so that I can tell which page provider to use

• • Selection only has two options: “Cancel” and “Insert”.
  • The user can select multiple documents from the list.
  • “Insert” is disabled if no document is selected.