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* Implement ASPageTable - It is a screen page table that can be used to quickly filter out objects in a certain rect without checking each and every one of them. - ASCollectionLayoutState generates and keeps a table that maps page to layout attributes within that page. - ASCollectionLayout (and later, ASCollectionGalleryLayoutDelegate) consults its layout state for `layoutAttributesForElementsInRect:`. This ensures the method can return as quickly as possible, especially on a large data set (I heard some people have galleries with thousands of photos!). * Address comments * Handle items that span multiple pages * Make danger happy