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ENH: Add qSlicerSingletonViewFactory

The new view factory can be used by both C++ and Python classes to register any singleton QWidget by calling factory->setWidget(QWidget*) and factory->setTagName(std::string).

Since the widget is a singleton, the factory can only be used to add a single such view to a given layout.

Spun off from https://github.com/Slicer/Slicer/pull/1061

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