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cleanup shut down of KSaneWidget

Alexander Stippich requested to merge astippich/libksane:cleanupShutdown into master

This MR cleans up the shutdown/closedevice procedure. Since the QImage is now allocated in the ScanThread, we can safely disconnect and delete the KSaneWidget immediately. The ScanThread is deleted once finished. I think I got all scenarios covered for the shutdown procedure, but please review carefully.

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