New SCSAM data loading method

[christopherlovell]

Method for loading new SCSAM SFZH data format implemented. This utilises the methods developed by Louise to ingest the previous version. Takes into account the recent star formation, particularly cutting of recent bins.

Currently relies on a couple of methods from scsample, developed by Austen Gabrielpillai, that can perhaps be simplified and streamlined.

Issue Type

• Enhancement

Checklist

• [x] I have read the CONTRIBUTING.md -->
• [x] I have added docstrings to all methods
• [x] I have added sufficient comments to all lines
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no pep8 errors
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes