Add functions for making deep and shallow copies of objects

[pineapplemachine]

The library should provide clone and cloneDeep functions. They should specially handle sequence and consumer types.

[pineapplemachine]

Brainstorm idea: Perhaps these functions should have special error reporting for inputs with cyclic references in debug builds and have undefined in behavior in production builds.

Or should the clone function just go ahead and correctly handle these cases? It could add nontrivial overhead to a tool whose overwhelmingly most common use case will be to copy objects without cyclic references. Perhaps a separate function with that handling could additionally be provided, so regular clone would disallow cyclic references and cloneCyclic would handle them?