Added small code snippet to TODO
Fixed loadedObjectsForUUIDs: to skip additional store item UUIDs rather than crashing

[[ctx loadedObjectForUUIDs: [ctx changedObjectUUIDs]] is now supported, even when some inner object declares a persistent keyed property.

Note: In the long run, -changed/inserted/updatedObjectUUIDs should be renamed to -changed/inserted/updatedItemUUIDs to increase the API consistency.
Added NS_RETURNS_NOT_RETAINED to methods that don't return retained arrays, when they are expected to due to the 'copy' prefix