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Add thumbwheel widgets
we use these in emergent for zooming, panning 3D display -- seem pretty useful there, but would be good to make sure they don't have same wrap-around and other bugs.
Closely related to Tumblers: http://doc.qt.io/qt-5/qml-qtquick-controls2-tumbler.html
Need some solution to this..
We will not support thumbwheel widgets. Thumbwheel widgets provide an imprecise and platform-specific way of doing things, which is strongly contrary to the principles of Cogent Core and the Go programming language.