Modernize Diviner

Summary:
Ref T4558. This diff modernizes the #diviner application. Basically:

• Add an edit controller, accessible at /book/$BOOK/edit/.
• Add edit/view policies.
• Added an action menu to the DivinerBookController to expose the edit interface.
• Allows projects to be associated with books.
• Implement edges and transactions.
• Implemented PhabricatorApplicationTransactionInterface in DivinerLiveBook.

Test Plan:

• Generated a Diviner book with ./bin/diviner generate.
• Added projects to a book and ensured that they persisted.
• Changed the view policy on a book and made sure it was effective.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T4558

Differential Revision: https://secure.phabricator.com/D13091