added scheduling of PRACH RX procedures in gNB and RU entities. Initialization of prach sequences added to nr_init.c

- Updated PRACH procedures and general code formatting
- gNB msg1 handling and RAR generation
- general bug fixing
- formatting
- missing headers
- RAR handling.

scheduling of PUCCH on MAC, passing PUCCH FAPI down to PHY (to be finished), filling DCI structures according to PUCCH (to be finished)

definition of config request fapi structures in UE and acquisition from rrc of config data (work in progress)

compiles, still needs to be tested gNB alone with rf-simulator / RF bench.

remove RRC_VERSION macros, simplify build-oai and CMakefile.txt accordingly, get rid of remaining compilation warnings (opt module improperly merged and patch asn1c files with tests against max 64 bits integer value)

- 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