VCSI: Invoke OIEP Post-processor in IIEP

The 'Invoke OIEP' post-processor allows for an OIEP to be invoked once the IIEP process has completed. If desired, this allows updating the representation of the system configuration in a remote Git branch immediately after the configuration has been imported.

As shown below, the option requires the ID of the OIEP to be invoked.