Create blend curves connecting a sequence of guide curves.

Input parameters:

1. Cr → Sequence of guide curves to connect.
2. Cl → Add a closing segment between the end of the last and the start of the first guide curve.
   •  True → Close
   • False → Open
3. Bl → Bulging factor for tangent and curvature continuous blends.
4. Bc → Blend continuity.
   • 0 → Position
   • 1 → Tangency
   • 2 → Curvature
   • 3 → G3
   • 4 → G4

Output parameters:

1. Cr → Complete curve with all joined guide curves and blend curves.
2. Bl → Individual blend curves.