Create a colour gradient out of a sequence of grips.

Input parameters:

1. Lc → List of grip parameters.
2. Cl → List of grip colours.
3. In → Gradient interpolation scheme.
   •  1 → Nearest
   •  2 → Immediate
   • 10 → Linear
   • 11 → Smooth
   • 20 → Cubic
   • 21 → Cyclic
   • 30 → Gaussian
4. Sp → Gradient colour space.
   •  0 → Standard RGB
   •  1 → Linear RGB
   •  2 → HSL
   •  3 → HSV
   •  4 → H*SP
   • 10 → CMY
   • 20 → CIE-Lab*
   • 21 → CIE-XYZ
   • 22 → CIE-Yxy
   • 23 → Oklab

Output parameters:

1. Gr → Colour gradient based on grips.