Add Retained smart pointer #97
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The smart pointer version of
StrongPtr, but with more guarantees.Notably, this has an
Deref<Target = T>implementation, which makes it more ergonomic and safer to use.See #95 for some of the reasoning behind this.
I'm thinking about removing
StrongPtrcompletely in favor of this (since it's behaviour can be achieved withRetained<Object>), but please voice your opinion on this.