R1:ed4a155c9168

Rename "IDPaged" to "CursorPaged", "executeWithPager" to "executeWith[Cursor|Offset]Pager"

Summary:
I'm trying to make progress on the policy/visibility stuff since it's a blocker for Wikimedia.

First, I want to improve Projects so they can serve as policy groups (e.g., an object can have a visibility policy like "Visible to: members of project 'security'"). However, doing this without breaking anything or snowballing into a bigger change is a bit awkward because Projects are name-ordered and we have a…