Code generation: still need to convert some "algebraic" stuff to "algebraic variable"

[agarny]

Fixes #1353.

[Copilot]

Pull request overview

This pull request fixes issue #1353 by standardizing variable naming in generated code from CamelCase to snake_case. The changes convert references to algebraicVariables, algebraic, externalVariables to their snake_case equivalents: algebraic_variables, external_variables.

Changes:

• Updated Python function signatures to use algebraic_variables parameter instead of algebraic
• Renamed all variable references from algebraicVariables to algebraic_variables in Python files
• Renamed all variable references from externalVariables to external_variables in Python files
• Updated C/C++ header function signatures to use algebraicVariables instead of algebraic
• Bumped version numbers from "0.6.0"/"0.7.0" to "0.8.0" across test resource files

Reviewed changes

Copilot reviewed 232 out of 243 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/resources/generator/variable_initialised_using_another_variable/model.py	Updated variable naming from CamelCase to snake_case and version bump
tests/resources/generator/variable_initialised_using_another_variable/model.h	Updated function signature parameter name
tests/resources/generator/variable_initialised_using_another_variable/model.c	Updated function signature and version
tests/resources/generator/unknown_variable_as_external_variable/model.*	Standardized naming conventions for algebraic and external variables
tests/resources/generator/sine_model_imports/model.*	Updated variable references and function signatures
tests/resources/generator/robertson_model_1966/model..	Applied consistent naming throughout ODE and DAE variants
tests/resources/generator/ode_/model.	Standardized variable naming across multiple ODE test cases
tests/resources/generator/noble_model_1962/model.*	Updated all variable references to snake_case
tests/resources/generator/hodgkin_huxley_squid_axon_model_1952/model..	Comprehensive updates across all model variants (ODE, DAE, external, tracking, etc.)

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