ASN.1 SelectionOption is not supported

Summary

ASN.1 SelectionOption is not supported, i.e. WITH SUCCESSORS and WITH DESCENDANTS. The IEE1609.2.1 standards are using extensively the statement WITH SUCCESSOR, therefore it would be nice to have it in Titan as well.

The issue originates from this forum topic: https://www.eclipse.org/forums/index.php/t/1112635/

/cc @aknappqwt @mmagyari