Create bi-directional links (CIMgen)
This is a continuation of https://git.rwth-aachen.de/acs/core/cim/pintura/issues/57. The problem is that the graph of CIM objects is not navigable in both directions. Example:
If we click on the synchronous machine object in the grid, we can not navigate to all associated objects that hold more parameters of the machine because some of the point to the machine but there is not reverse link.
This should be solved in CIMgen.