[Merge] lp:~dandrader/qtubuntu/shellRotation into lp:qtubuntu

[Daniel d'Andrada]

> Are these changes backwards-compatible? If not, we need to add versioned
> Breaks/Depends as needed.

Yes, they are.
If you install only qtubuntu/shellRotation, without unity8/shellRotation and qtmir/supportedOrientations, it all keeps working normally.
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https://code.launchpad.net/~dandrader/qtubuntu/shellRotation/+merge/242215
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