Rework mir.interpolate

[9il]

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[codecov-io]

Codecov Report

Merging #213 into master will decrease coverage by 0.09%.
The diff coverage is 90.62%.

@@            Coverage Diff            @@
##           master     #213     +/-   ##
=========================================
- Coverage   92.34%   92.24%   -0.1%     
=========================================
  Files          42       41      -1     
  Lines        8311     8257     -54     
=========================================
- Hits         7675     7617     -58     
- Misses        636      640      +4

Impacted Files	Coverage Δ
source/mir/ndslice/topology.d	99.55% <ø> (ø)	⬆️
source/mir/interpolate/package.d	98.82% <100%> (-0.12%)	⬇️
source/mir/ndslice/allocation.d	98.65% <100%> (+0.01%)	⬆️
source/mir/interpolate/constant.d	86.95% <70%> (-9.48%)	⬇️
source/mir/interpolate/linear.d	95.23% <83.33%> (-2.84%)	⬇️
source/mir/interpolate/polynomial.d	95.83% <91.66%> (-1.08%)	⬇️
source/mir/interpolate/spline.d	91.68% <95.91%> (-0.39%)	⬇️
source/mir/interpolate/pchip.d
... and 2 more

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