New feature: User Notes
* Add a "Notes" tab to user profile pages and galleries.
* Users can create one private note about another user.
* Admins can see all notes left about a user.
* Admins also see Feedback & Reports regarding the user on that page.
Bring back the online chatters list
* The Usernames are filtered down based on blocklist status.
* Add the Contact page where users can contact the site admins for feedback or
to report a problematic user, photo or message.
* Reports go into the admin Feedback table.
* Admin nav bar indicates number of unread feedbacks.
* Add "Report" button to profile pages, photo cards, and the top of Direct
Message threads.
Misc changes:
* Send emails out asynchronously for more responsive page loads.
