Attempting to make PModelConst inherit CoreConst

[tztsai]

Make PModelConst inherit CoreConst, and merge the usage of pmodel_const and core_const in PModelEnvironment.

Description

Attempting to make PModelConst inherit CoreConst and merge their usages.

Fixes #161

Type of change

• New feature (non-breaking change which adds functionality)

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.85%. Comparing base (8f7d032) to head (fa3fe33).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #201      +/-   ##
===========================================
- Coverage    94.86%   94.85%   -0.01%     
===========================================
  Files           28       28              
  Lines         1499     1497       -2     
===========================================
- Hits          1422     1420       -2     
  Misses          77       77              

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