Consistently handle orientation setting throughout ViewBase and MixDeviceWidget
The ViewBase retains the master orientation setting, as a separate Qt::Orientation value; it is eliminated from ViewFlags. ViewBase subclasses use this setting. MixDeviceWidget subclasses ask their associated view for the same setting. ViewBase subclasses (ViewSliders and ViewDockAreaPopup) query the appropriate application setting via their virtual orientationSetting().
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