Provide a simulator in biosimulators

[matthiaskoenig]

sbmlsim should be available as a biosimulator.
https://biosimulators.org/
This depends on finishing the SED-ML L1V4 support (see #61)

[matthiaskoenig]

See https://biosimulators.org/standards/simulator-specs
https://drive.google.com/file/d/1Q0X6GNQlT5PfZOcBNVu1B92SSAxJWrnS/view