2.1 refactor and port the code, green light

[w-klijn]

name: TVB-NEST co-simulation (Lionel v2) about:

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Summary

Tasks

• [ ] Fork/copy into cosim repo stucture #64
• [ ] Refactor code according to details in #107 and #102
• [ ] Define green light requirements (tests)

Requirements

Acceptance criteria

[sontheimer]

Added first tasks. Summary, description missing.