Instead of looping over UEs and all DL config Req/HI DCI0, loop first
over all DL config Req/HI DCI0, and for each, match UE.  Lowers CPU
traffic for high traffic situations.

UE_list_t is now used as a separate list. It can be e.g. used in the
scheduler to mark groups of users. The original UE_list_t is renamed to
UE_info_t to reflect that it is a container for information about UEs.

ignoring command line paramters clock_source and time_source in lte-softmodem and harmonizing it with nr-softmodem
time_source and clock_source handled separately in usrp_lib.cpp

fixing beam to boresight for testing

Using "--allow-unauthenticated" with apt-get disables package verification, allowing to install untrusted/modified packages into the development system. Fixed calls to apt-get to make sure that packages are verified.

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

2 issues at this point:
1.rfsim for FR1 works sometimes. other times 100 consec PBCH errors.(this commit)
2.PDCCH and PDSCH are not transmitted in correct slots. problem might be with sf_ahead.