- now the FAPI interface copies the struct directly to NR_UE_PRACH
- NR_PRACH_CONFIG_COMMON and NR_PRACH_CONFIG_INFO have been removed from FP

added longer prefix in PRACH symbol zero period for 15/30 kHz SCS. Both gNB and UE processing is modified. prachsim is functional again with new FAPI interfaces.

- RA resource selection and transmission
- MAC header structs for RA
- RA procedure msg1 fixes
- code cleanup

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

Bugfix: 1. fix the initial memory allocation; 2. correct the generation of the prach signal according to specs

1. assertion relax for preamble format 3; 2. memset bugfix for RB=106; 3. repetition bugfix for format A3 and B3

gNB runs fine. UE yet to be tested.

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)

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)