Strengthen data integrity and the simulation testing

[GREENRAT-K405]

The current test suite in tests/test_concore.py validates basic API availability and simple file reading but lacks coverage for some important data-handling and state-tracking logic in concore.py.

I propose adding unit tests for convert_numpy_to_python, initval, default_maxtime, unchanged(), parameter parsing(e.g., key=val;key2=val2) to enhance strengthen data integrity and simulation testing.

[GREENRAT-K405]

@pradeeban I have already tried to solve this issue, but after some quality checks I will raise the solution.

[pradeeban]

@GREENRAT-K405 that is awesome!