Include second RRC Reconfiguration message to carry DRB, SRB2 configuration and NAS PDU Session Establishment Accept message

-Remove DRB and SRB configuration from the first RRC Reconfiguration message. Missing radio configuration to be filled in first RRC Reconfiguration message.

added generation of initial Master Cell Group Configuration for both CU/DU and monolithic gNB.

Tested until transmission of RRCSetupComplete from UE

- a new section in the configuration file to select security algorithms,
  with new code to deal with it
- cleanup CG-ConfigInfo: specs seem to indicate that we must not
  add mcg_RB_Config; the gNB has to deal with that
- as a consequence, modify fill_default_rbconfig() that is called in
  every cases and needs security and bearer parameters

The new section in the configuration file looks like:

    security = {
      # preferred ciphering algorithms
      # the first one of the list that an UE supports in chosen
      # valid values: nea0, nea1, nea2, nea3
      ciphering_algorithms = ( "nea0", "nea2" );

      # preferred integrity algorithms
      # the first one of the list that an UE supports in chosen
      # valid values: nia0, nia1, nia2, nia3
      integrity_algorithms = ( "nia0" );
    };

Wireshark (version 3.3.2) was not happy.
https://asn1.io/asn1playground/ was not happy.

Let's make them happy.

So then everyone is happy.

Add rrc_gNB_process_NGAP_PDUSESSION_RELEASE_COMMAND and rrc_gNB_send_NGAP_PDUSESSION_RELEASE_RESPONSE

- Added a function to add PTRS values in RRC context.
- This function can be used to overwrite the PTRS values also.
- When RRC config file contains PTRS values then this function can be used
respectively in RRC context.

Creation of fill_default_coresetZero() and fill_default_searchSpaceZero(). Resource allocation and transmission of the DCI of SIB1. Partial implementation of the reception of the DCI of SIB1.

This commit contains work done by Eurecom and by Benetel.

Modify compilation warning

This commit introduces several enhancements in X2AP and RRC to deal
with ENDC. The main goal is to deal with UE's on/off and with various
errors.

The following work is included:

    - DC prep and DC overall X2 timers
    - X2 messages for UE release and DC timers' timeout

Open problems:

    - what to do when the UE sends an scg Failure? This commit removes
      the UE. And this removal may not be correctly done
    - UE removal in the gNB's PHY layer (a next commit is coming,
      but it is hackish and will need a rework)

-Upon reception of SgNB Addition Request from the eNB, the gNB configures pdcp and rlc entities for the list of DRBs provided from the eNB

ENDC path switch S1-U: Integrated S1AP E-RAB-Modification indication message at eNB, interfacing with RRC and X2AP to get proper configuration of E-RABs to be modified and GTP-U configuration at gNB

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

UE-Capability parsing for NR components. Emulate CG-ConfigInfo generation for phy-test mode. This version is ready for X2 EN-DC integration