Add DelayedConstructor<T> #2579
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* Add util::DelayedConstructor * Run sync_project on any Firestore change since start * Use DelayedConstructor in a few places to show how it works
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This is useful for embedding C++ objects of type
Tinside Objective-C objects whenThas no default constructor or is not a movable type. It works by allocating space for T withstd::aligned_storageand then adding anInit()method that uses placement new to later construct the object in the allocated space.See class comments for more detail and restrictions.