Removed a handful of now defunct constants and methods.

[TaranRallings]

Description

This removes a handful of constants and methods that were left over from my original implementation of energetics and mortality. These are no longer in use and so I've cleaned them out.

Fixes # (issue)

Type of change

• [ ] New feature (non-breaking change which adds functionality)
• [ ] Optimization (back-end change that speeds up the code)
• [x] Bug fix (non-breaking change which fixes an issue)

Key checklist

• [x] Make sure you've run the pre-commit checks: $ pre-commit run -a
• [x] All tests pass: $ poetry run pytest

Further checks

• [] Code is commented, particularly in hard-to-understand areas
• [ ] Tests added that prove fix is effective or that feature works
• [ ] Relevant documentation reviewed and updated

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.91%. Comparing base (48e4b0a) to head (c92e94b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #482 +/- ## =========================================== - Coverage 94.95% 94.91% -0.04% =========================================== Files 70 70 Lines 3886 3857 -29 =========================================== - Hits 3690 3661 -29 Misses 196 196 ```

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