[core] Resolve state from a state config object

[davidkpiano]

This PR makes it easier to restore state by allowing a state config object to be passed into machine.resolveState(object):

const stateConfig = JSON.parse(localStorage.get('some-state-key'));

const restoredState = someMachine.resolveState(stateConfig); // no need to convert to State instance

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Latest commit: ddd9c53

The changes in this PR will be included in the next version bump.

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xstate	Minor

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[Andarist]

This has a somewhat confusing name. I would call the resolvedState what gets returning from this function but this is just an intermediate value. Maybe something like resolvedInput/resolvedArg would make more sense here?

[davidkpiano]

Ready for re-review

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