Simulation export settings

The settings depend highly on the employed tool, but some settings are universal. These are primarily given to the Simulation class as PCell parameters in contrast to export functions corresponding to different programs. Please refer to the docstrings and implementations for details:

• export_ansys()

• export_elmer()

• export_sonnet()

Elmer export, on the other hand, has some details explained in Gmsh/Elmer export.