#861 remove external submodels

[valentinsulzer]

Description

Removed unused model options

Fixes #861

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• 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:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #862 into develop will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #862      +/-   ##
===========================================
- Coverage    97.68%   97.66%   -0.02%     
===========================================
  Files          209      207       -2     
  Lines        10588    10512      -76     
===========================================
- Hits         10343    10267      -76     
  Misses         245      245

Impacted Files	Coverage Δ
...amm/models/submodels/current_collector/__init__.py	100% <ø> (ø)	⬆️
...bamm/models/submodels/thermal/x_lumped/__init__.py	100% <ø> (ø)	⬆️
...m/models/full_battery_models/base_battery_model.py	100% <ø> (ø)	⬆️

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[rtimms]

thanks