update to version 0.20.5 from upstream

[chliny]

Version 0.20.5: Added two codeword support, refactored PUCCH channel decoding for 1, 1A, and 1B, added SR configuration index mapping, added liblte_common unit tests, and properly handling FI fields for multiple AMD PDUs in the LTE library, added helper functions and interprocess message queue support to the tools library, added SR support, moved GW, MME, and PDCP away from the singleton pattern, added direct IPC to a UE for MAC and PHY, removed QOS and fixed UL scheduling in favor of SR and BSR based UL scheduling, and refactored the AMD reception buffer to handle more than one PDU per SN in LTE_fdd_enodeb, and fixed a typo in lte_pucch_demod.m see also openlte