Connect to the FLORIS engine

[MarcusBecker-GitHub]

OFF is currently interfacing FLORIS through the FLORIS interface. This creates a computational overhead of setting up a new simulation from scratch at every iteration.
A better solution would be to access the wake solver of FLORIS directly. Ideally OFF could modify the state of the FLORIS simulation without reinitialisation. How this would look like and how much effort this would entail is not clear yet.