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Draft: Implement NR-UE Deregistration procedure

Robert Schmidt requested to merge deregistration into develop
  • UE 5G NAS: add deregistration request message
  • Reimplement ITTI wait mechanism using semaphores instead of signals (which are not safe to be used in signal handlers) and allows to override the signal handler
  • nrUE: send deregistration message on first ^C, will stop automatically if RRC release received; second ^C force-stops
  • Refactor of 5G UE NAS: one common structure for 5G NAS info instead of multiple (uicc_t, ue_sa_security_key_t), remove useless module ID, put duplicated code into separate functions...
  • Fix bug: add NAS message counters instead of hardcoding
Edited by Robert Schmidt

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