Added RangeView (SpinBox) class

This implements the RangeView class, which only supports QSpinBox at the moment.  Plan on adding dial and slider shortly - shouldn't be hard to do.

Also did make one more change to creating settings - simplified constructor.  Hopefully won't complicate any other on-going work.

Proxy Selection Test code in UserSettings demos most of the views...

Update:: implemented QSlider and QDial