remove L1L2 task, also remove some call to send messages to UNKNOWN_TASK, removed in new itti. Align LOG in rlc sources with new LOG code (remove DEBUG_RLC...)

For whatever reason most of the files had their permission
changed from 644 to 755, which is not wanted.

S1AP PATH SWITCH REQUEST/REQUEST ACK/FAILURE
RRC MEASUREMENT REPORT
MINOR CHANGES IN MAC LAYER

RRC timer thres removed from UE context and added to eNB RRC context, value 0 of thres equivalent to infinity

rework of configuration for eMTC/Sidelink. Removal of warnings introduced by eMTC code. Validation of configuration component for eMTC and regular LTE. Sidelink is still not configured.

rrc inactivity timer created, S1 ue context release request sent on timeout, timer set at RRC connection complete reception

1. Modify all expressions using original LTE-RRC data types for new generated ones
2. Does not change any program logic

Use common log mechanism in layer 3, mapping specific macros to common ones and extending common log utilities to support specific layer3 requirements

LOG_F replaced by LOG_DUMPMSG. Add a generic function to dump a buffer or message. Go on with LOG_M implementation improvement. Remove redundant options to enable/disable logs.

remove compilation warnings, especially when disabling T_TRACER. enhance LOG_M macro implementation, introduce LOG_DEBUG_XXX macro to replace #ifdef DEBUG_XXX

log.c simplification, fix usefull functionality which never worked, move all log code from openair2 to common

1. It's no need to modify LTE-RRC's ASN.1 file for enabling option group
   feature in generate_asn1.
2. It's no need to patch the C header files generated from
   LTE-RRC/S1AP/X2AP's ASN.1 in fix_asn1.
3. It's no need to pre-process S1AP/X2AP's ASN.1 for enabling information
   object class feature by asn1tostruct.py.

This commit requires an un-official version of asn1c which are
collaboration of asn1c community members and `build_helper` is modified
in this commit accordingly :

  https://github.com/brchiu/asn1c/tree/velichkov_s1ap_plus_option_group

This asn1c can also convert ASN.1 of 5G NR RRC (38.331, v15.1.0) and
generate C files with -findirect-choice command line option without
tweaking ASN.1 file.

Examples for how to use this asn1c for S1AP are in S1AP files, e.g.
s1ap_eNB_nas_procedures.c and s1ap_eNB_handler.c.

There is an modified openair-cn (based on tag 0.5.0) with this new asn1c at :

  https://github.com/brchiu/openair-cn/tree/new-asn1c

Basic S1AP interaction and data transfer operation between OAI eNB and
this modified openair-cn has been tested.

Note: Community version of asn1c is keeping evolved to provide better usage.

Remove compilation warnings, also fix telnet server compilation failure and NB-IoT shared lib compilation failure introduced when reviewing L1 sources  organization