Develop nr fixes 2019w23

See merge request oai/openairinterface5g!601

Conflicts:
	cmake_targets/build_oai
	executables/nr-gnb.c
	openair1/PHY/INIT/nr_init.c
	openair1/PHY/defs_gNB.h
	openair1/SCHED_NR/fapi_nr_l1.c
	openair2/LAYER2/NR_MAC_gNB/config.c
	openair2/LAYER2/NR_MAC_gNB/mac_proto.h
	openair2/RRC/NR/rrc_gNB.c

- reworked configuration file and configuration for gNB (write directly to ASN1 structure from config module instead of passing intermediate structures)
- added prach procedures for gNB with configuration of PRACH L1/L2 parameters

Integration nr 2019 w21

See merge request oai/openairinterface5g!598

initial prach implementation. Splitting of components for RU (FFTs) and L1 (detection). Update of UE to include all formats (for 30 kHz SCS case on initial BWP)

this commit includes pucch format0 receiver and testbench for pucch format0 without ofdm. Also it has some fixes to pucch_nr.c