Add a reference to the root actor on the system object

[kevinmaes]

This would allow any actor within the system to send events to the system's root actor without needing to know the root's systemId that's passed into interpret(rootActor, { systemId: 'root-id' })

Example: Sending a message to the root from any actor in the system: sendTo(({ system } ) => system.root, { type: 'to root', message: 'Message to root' });

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Latest commit: 57fb74b2945ece2d1f6df43e2ecaf6d7de3034f2

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Name	Type
xstate	Minor

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