merge MR978 (5G nFAPI) into develop

.gitignore

CONTRIBUTING.md

NOTICE.md

ci-scripts/.gitignore

ci-scripts/Jenkinsfile-gitlab

ci-scripts/args_parse.py

ci-scripts/checkAddedWarnings.sh

ci-scripts/checkCodingFormattingRules.sh

ci-scripts/conf_files/gnb.band78.tm1.106PRB.usrpn300.conf

ci-scripts/main.py

ci-scripts/ran.py

ci-scripts/xml_files/fr1_multi_node_terminate.xml

ci-scripts/xml_files/fr1_toggle_cots_ue.xml

openair1/PHY/MODULATION/slot_fep_nr.c

openair1/PHY/NR_REFSIG/nr_refsig.h

openair1/PHY/NR_TRANSPORT/nr_dci.c

openair1/PHY/NR_TRANSPORT/nr_dci_tools.c

openair1/PHY/NR_TRANSPORT/nr_dlsch_tools.c

openair1/PHY/NR_TRANSPORT/nr_transport_proto.h

openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c