* Add support for Web Push Notifications when users receive a new Message or
Friend Request on the main website.
* Users opt in or out of this on their Notification Settings. They can also
individually opt out of Message and Friend Request push notifications.
* Add a ChangeLog table to collect historic updates to various database tables.
* Created, Updated (with field diffs) and Deleted actions are logged, as well
as certification photo approves/denies.
* Specific items added to the change log:
* When a user photo is marked Explicit by an admin
* When users block/unblock each other
* When photo comments are posted, edited, and deleted
* When forums are created, edited, and deleted
* When forum comments are created, edited and deleted
* When a new forum thread is created
* When a user uploads or removes their own certification photo
* When an admin approves or rejects a certification photo
* When a user uploads, modifies or deletes their gallery photos
* When a friend request is sent
* When a friend request is accepted, ignored, or rejected
* When a friendship is removed
