ENABLE_ITTI macro removal, modified telnet server to support all executables, modified record player to finalize switch to run-time option and allow usage with any device

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

build improvements: allow build mode selection (-g -G options) allow all exec build in one pass, remove remaining USE_MME macros in nr code

Mainly comestics and integer type management
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

- Initial gNB DLSCH and UE spec scheduling implentation
- MAC PDU generation (including header as per TS 38.321)
- MAC PDU processing at UE side with extracion of TA updates
- General code cleanup
- Introduced NR MAC COMMON folder, moved common files here

 - gNB now only sends samples to USRP when DL slot. (should do the same for UE)
 - increased sf_ahead to 6
 - fixed timestamp for usrp_write at UE

 - gNB now only sends samples to USRP when DL slot. (should do the same for UE)
 - increased sf_ahead to 6
 - fixed timestamp for usrp_write at UE

- removed gNB RT from "ru_procedures.c" to "nr_ru_procedures"
- added a new thread "nr_feprx_thread"
- added some functionalities for fep for rx in "nr_ru_procedures.c"

Conflicts:
	openair2/GNB_APP/gnb_config.c

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)

- removed gNB RT from "ru_procedures.c" to "nr_ru_procedures"
- added a new thread "nr_feprx_thread"
- added some functionalities for fep for rx in "nr_ru_procedures.c"

testing merge with develop-nr. removal of pthread_mutex_timedlock, we were using the wrong time argument (needed to be absolute).