fixed indendation
updated ulsim CI test parameters

UHD documentation: "A tune request instructs the implementation how to
tune the RF chain."

This commit makes this configurable, from nr-softmodem, nr-uesoftmodem,
lte-softmodem, and lte-uesoftmodem.

The basic simulator can be replaced with the RF simulator. Use option
--rfsim.

In case of TDD we usually disable TX during RX.
Unfortunately some USRPs create self-interference after disabling TX.
To be able to work-around this issue, we add the flag "--continuous-tx".

The following was changed in this commit:
 - A new struct in the mac instance was created
   for all emulated L1 fields.
 - NR UE RRC state bug was fixed
 - Checking the RAR rnti based on the MAC instance
   ra.ra_rnti and not hardcoding to 0x10b
 - Modified the name of the new emulate_l2 flag
   to make sense: emulate_l1

PRB based averaging can activated from command line options

1. If VNF is slower than PNF, next scheduling will be done after resync.
2. If VNF is unstable in slot progress, next scheduling will be done in next stable status.
3. SFN/SLOT indications are queued in nrUE.
4. get_queue is used instead of unquque for FIFO operation.

This commit also removed MAX_NUM_NEIGH_CELLs and
replaced it with MAX_GNB_CELLS. This was a minor change
OAI added. The standalone sockets for the NR UE correctly
connect to the proxy. We are currently receiving dl_tti
messages from the proxy.

This commit is not currently building, but I wanted
to be able to save the changes that I have added.

Set path for libconfig include directive, so that all config files could be located in the same directory. minor fixes in softmodem-common

when signal quality drops. when cmd line option used ue goes back to sync mode

Included command line option to select interpolation method

Leaving ru_thread and L1 stats thread