Allow nested routes without parent component

[ghost]

This issue already exist, but was closed: #2105 I do believe it shouldn't have been.

The PassThrough solution will most likely do it, but it is a workaround. I do not want to specify every view as a pass through.

This should imo. be supported by vue-router directly, making it easier to design ones system as small sub components, allowing each component to know it's own navigation and be loosely coupled.

Interface wise I would say it makes sense to simply default to this behavior if component isn't specified.

Also, I don't know if it's the same or another issue, but name hierarchies would make this feature quite powerful

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