Issue 1501 different submodels

[valentinsulzer]

Description

Reformats some model options that were a bit out of date.
Allows different options for the particle submodel in each electrode

Fixes #1501

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 #1503 (22256e8) into develop (08de417) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1503   +/-   ##
========================================
  Coverage    98.34%   98.34%           
========================================
  Files          296      296           
  Lines        17141    17149    +8     
========================================
+ Hits         16858    16866    +8     
  Misses         283      283           

Impacted Files	Coverage Δ
...m/models/full_battery_models/base_battery_model.py	99.69% <100.00%> (-0.01%)	⬇️
...ybamm/models/full_battery_models/lead_acid/full.py	100.00% <100.00%> (ø)
...dels/full_battery_models/lead_acid/higher_order.py	98.11% <100.00%> (ø)
...ybamm/models/full_battery_models/lead_acid/loqs.py	100.00% <100.00%> (ø)
...bamm/models/full_battery_models/lithium_ion/dfn.py	100.00% <100.00%> (ø)
...bamm/models/full_battery_models/lithium_ion/spm.py	100.00% <100.00%> (ø)
...amm/models/full_battery_models/lithium_ion/spme.py	100.00% <100.00%> (ø)

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[rtimms]

thanks!