list active cases & create petri net

Frontend/export/eventlog.csv

Frontend/upload/optis.csv

backend/__pycache__/agent.cpython-311.pyc

backend/__pycache__/environment.cpython-311.pyc

backend/__pycache__/eventlog.cpython-311.pyc

backend/__pycache__/simplesimmodel.cpython-311.pyc

backend/eventlog.py

backend/main.py

backend/petrinet.py