SAP2000_Toolkit: Align to changes for BHoM_Adapter refactoring level 04

[FraserGreenroyd]

Parent issue(s) or Pull Request(s) causing the changes:

https://github.com/BHoM/BHoM_Adapter/pull/164

Description:

Updating toolkit to align with refactoring of the parent BHoMAdapter.

To be done by 24th January 2020

[al-fisher]

Reopening as was referenced in PR - but not resolving.