Allow displaying the inspector docked to the right/left

[Reinmar]

I tend to miss vertical space when both the inspector and the JS console are open. Docking the inspector to the right would be awesome, although, I'm not sure how to do that to not break the page styles... Maybe it could be a simple option that works only when the page is styled in a way that there's space next to the editor (e.g. a narrow content column)?

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