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

 added value check for TC_ESC01

 added a function to decode and normalise the escaped characters

 renamed the positive tortture testcases

 fixed TC_LONGREQ to remove double-quotes in the nameaddr field

 allow returning an undecoded value in TC_SCALAR* (all we need is a codec that does not crash)

 support for decoding quoted strings

 added function for normalising quoted strings
 
 TODO: how to represent unicode characters ?

 added value check for TC_SEMIURI

 renamed negative testcases