R1:c45ba3041682

Redesign Diviner

Summary:
This implements `PHUIDocumentViewPro` which should move to be the base for all documents (Phame, Phriction, Legalpad, Diviner). Overall this feels really good to me, but I'd like to roll it out into Diviner specifically first to work through the issues and then move into other apps and drop `PHUIDocumentView` once everything is converted. Some features are:

- White Background, no border on page
- Table of Contents is move to hidden menu (more space for documentation)…