partial code for NR SIB1, existing bugs fix, merge develop

cmake_targets/CMakeLists.txt

cmake_targets/install_ubuntu20.04

common/utils/LOG/log.h

common/utils/LOG/vcd_signal_dumper.c

common/utils/LOG/vcd_signal_dumper.h

doc/SW_archi.md

executables/nr-uesoftmodem.c

executables/split_headers.h

openair1/PHY/LTE_TRANSPORT/dlsch_modulation.c

openair1/SCHED_NR/phy_procedures_nr_gNB.c

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_bch.c

openair2/RRC/NR/L2_nr_interface.c

openair2/RRC/NR/MESSAGES/asn1_msg.c

openair2/RRC/NR/rrc_gNB.c