Interpolate values in a list.

Input parameters:

1. V → Values to interpolate.
2. t → Normalised interpolation parameter.
3. Mt → Method to use for interpolating.
   • 0 → Immediate
   • 1 → Nearest
   • 2 → Linear
   • 3 → Catmull
   • 4 → Smooth
   • 5 → Smoother
   • 6 → Smoothest

Output parameters:

1. Vl → Interpolated value.