FMIWrapperQ should support port names

[robbr48]

Is your improvement request related to a problem? Please describe.
Ports are named P1, P2, P3 ... depending on their order in the portspecs parameter. This can be confusing for e.g. hydraulic valves, where they are expected to be called "PP", "PT", "PA" and so on.

Describe the solution you'd like
Allow user to choose a port name in the portspecs parameter, e.g. "NodeHydraulic,PP,x,y,z...". This must be backwards compatible with the current solution, i.e. work even if no port name is provided.