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Group together externally-managed UIDartState. It's a frequent pattern to enable access to shell resources from the framework via UIDartState. These handles are passed through several other objects, where they lay mostly dormant. This refactor just aims to ease maintenance of this state. UIDartState is essentially just an easy to extend bus for dropping off the shell kids in UIDartState, with constructors/operators that remove the need for providing a full initializer lists in unittests.