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)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• 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 ✅

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

Additional details and impacted files

@@             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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[alexdewar]

LGTM! Always good to do a bit of spring cleaning.