* Features
- NGAP AMF status indication
- Add UE Retention Information support
- Update NAS with Rel 16.14.0 IEs
* Refactoring code for Encode/Decode functions
* Cleanup NAS lib
* Fixes
- Fix typo for N1N2MessageSubscribe
- Fix issue when receiving PDU session reject from SMF
* Tech debt
- Reformating of the SCTP code
- Refactor promise handling
- Removing dependencies to libconfig++ (Only YAML file can be read as configuration)