probably should be better to change module name into LibIot_PIXITS

Comments are added

 misc change in Loopback tests

 Added empty sdp_codets.cpp

 Changed LoopbackTC generator

 fixed matching of header-name

 try to match the CRLF before the header name in MessageHeader so that the mismatch error message is more meaningful

 do not remove escaped characters in the tag parameter in the From header

 hanle escaped chars in generic paraameter name only if it is in the SipUrl semicolon parameter list