* Add a user privacy setting so they can gate who is allowed to share private
photos with them (for people who dislike unsolicited shares):
* Anybody (default)
* Friends only
* Friends + people whom they have sent a DM to (on the main website)
* Nobody
* Add gating around whether to display the prompt to unlock your private photos
while you are viewing somebody's gallery:
* The current user needs at least one private photo to share.
* The target user's new privacy preference is taken into consideration.
* The "should show private photo share prompt" logic is also used on the actual
share page, e.g. for people who manually paste in a username to share with.
You can not grant access to private photos which don't exist.
* Improve the UI on the private photo shares page.
* Profile cards to add elements from the Member Directory page, such as a
Friends and Liked indicator.
* A count of the user's Private photos is shown, which links directly to
their private gallery.
* Add "Decline" buttons to the Shared With Me page: so the target of a private
photo share is able to remove/cancel shares with them.
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