CAGD
TODO
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add support for multiple curves
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add subdivision to Bézier scene
- add button for sundividing Bézier curve
- add input field for the point on which the curve should be subdivided
- add function for subdividing Bézier curve
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add new scene for B-splines
- add support for drawing control points
- add functions for saving and working with control points
- add input-field for B-spline knot vector
- add functions for saving and working with knot vector
- add buttons for drawing, elevating, and clearing B-spline
- add function for drawing B-spline
- add function for elevating B-spline
- add function for subdividing B-spline
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change so the button sizes are not relative to the screen