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

 fixed matching passwors  in UserInfo

 Minor code change

 Added files required to run Loopback tests

 Changed Loopback TCs for debugging purpose

 Fixed "comment" and "quoted-string" encoding issues

 Encoding support for RFC 5009

 Encoding support for RFC 3841

 Encoding support for RFC 4244

 Encoding support for RFC 3455

 Encoding support for RFC 3329

 Encoding support for RFC 3327

 Encoding support for RFC 3326

 Encoding support for RFC 3325

 Encoding support for RFC 3323

 Encoding support for RFC 3265 and RFC3313

 Encoding support for RFC 3262

 Modified LoopbackTestcase template

 Encoding support for RFC 3261

 added value check for TC_UNREASON

 replace undisplayable characters with '?' in the payload field

 added value check for TC_ESCNULL

 keep control characters escaped

 renamed the newly validated tests

 fixed the position of From/To/Contact parameters

 fixed non-matching of url parameters when there are multiple parameters

 fixed value check for TC_BADBRANCH

 fixed matching urls containing [?,;] but which are not enclosed in <>

 added value check for TC_REGESCRT

 added value check for TC_ESCRURI

 added value check for TC_ESC02

 support matching escaped characters in header names

 do not remove escape sequences in non-generic parameters of via

 fixed value check in TC_SEMIURI with correct escaped string

 transformed TC_REGBADCT into a negative test