Structure_Engine: IInterpolateProfile not considering TaperedProfile positions

#### Description:

Issue following on our last discussion about ACORN non-prismatic beams with @al-fisher, @IsakNaslundBh, @peterjamesnugent , @alelom, and @pawelbaran. Apologies in advance for any newbie formal mistake, this is my first ever GitHub issue.

#### Steps to reproduce:

I’m reproducing a Grasshopper implementation of a non-prismatic beam, this time using BHoM in GH. Currently experimenting with a TaperedProfile of a TSectionProfile beam, with four profiles in oddly distributed positions (0.0, 0.2, 0.5, 1.0). When using IInterpolateProfile for visualizing shape of beam, it seems input profiles are placed evenly along the bar, whereas expected distribution should be according to input positions.

#### Expected behaviour:

Distribution of profiles along bar should be according to input positions.

#### Test file(s):

Attaching .zipped Grasshopper file.
[201203_ACORN_nonprismaticbeam.zip](https://github.com/BHoM/BHoM/files/5637540/201203_ACORN_nonprismaticbeam.zip)