Noa Alice

I want to note that 2D and 3D graphics are inherited in Qt from different classes. Also you can't use [Q3DSurface](https://doc.qt.io/qt-5/q3dsurface.html) and [Q3DScatter](https://doc.qt.io/qt-5/q3dscatter.html) in a single widget together. I encountered...

What about license? QCustomPlot has GNU GPL...