PersistentInfo lookup optimizations #236
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First, we don't really need a shared_ptr from PersistentCopy(), since we're not sharing it with anyone yet. But then, we don't really need a pointer at all and we could just return by value and let call-sites move the value to the heap themselves if they need it there. At this point, the function body is trivial, so we don't really need the function.
Otherwise we don't have anything to synchronize.
These overloads take a Persistable&, as opposed to a QString, which allows directly saving and retrieving Persistables without additional lookups.
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This includes #230.