Remove all lines containing cvs/svn "$Id$" keyword.

This keyword is not expanded by Git which means it's not replaced with the
correct revision value in the releases made using git-based scripts and it's
confusing to have lines with unexpanded "$Id$" in the released files. As
expanding them with Git is not that simple (it could be done with git archive
and export-subst attribute) and there are not many benefits in having them in
the first place, just remove all these lines.

If nothing else, this will make an eventual transition to Git simpler.

Closes #14487.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74602 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/strings/crt.cpp

@@ -3,7 +3,6 @@
 // Purpose:     Test for wx C runtime functions wrappers
 // Author:      Vaclav Slavik
 // Created:     2004-06-03
-// RCS-ID:      $Id$
 // Copyright:   (c) 2004 Vaclav Slavik
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////

tests/strings/iostream.cpp

@@ -3,7 +3,6 @@
 // Purpose:     unit test of wxString interaction with std::[io]stream
 // Author:      Vadim Zeitlin
 // Created:     2007-10-09
-// RCS-ID:      $Id$
 // Copyright:   (c) 2007 Vadim Zeitlin <vadim@wxwidgets.org>
 ///////////////////////////////////////////////////////////////////////////////
 

tests/strings/numformatter.cpp

@@ -3,7 +3,6 @@
 // Purpose:     wxNumberFormatter unit test
 // Author:      Vadim Zeitlin
 // Created:     2011-01-15
-// RCS-ID:      $Id$
 // Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
 ///////////////////////////////////////////////////////////////////////////////
 

tests/strings/stdstrings.cpp

@@ -3,7 +3,6 @@
 // Purpose:     wxString unit test
 // Author:      Vadim Zeitlin, Wlodzimierz ABX Skiba
 // Created:     2004-05-07
-// RCS-ID:      $Id$
 // Copyright:   (c) 2004 Vadim Zeitlin, Wlodzimierz Skiba
 ///////////////////////////////////////////////////////////////////////////////
 

tests/strings/strings.cpp

@@ -3,7 +3,6 @@
 // Purpose:     wxString unit test
 // Author:      Vadim Zeitlin, Wlodzimierz ABX Skiba
 // Created:     2004-04-19
-// RCS-ID:      $Id$
 // Copyright:   (c) 2004 Vadim Zeitlin, Wlodzimierz Skiba
 ///////////////////////////////////////////////////////////////////////////////
 

tests/strings/tokenizer.cpp

@@ -3,7 +3,6 @@
 // Purpose:     wxStringTokenizer unit test
 // Author:      Vadim Zeitlin
 // Created:     2005-12-20 (extacted from strings.cpp)
-// RCS-ID:      $Id$
 // Copyright:   (c) 2004-2005 Vadim Zeitlin
 ///////////////////////////////////////////////////////////////////////////////
 

tests/strings/unichar.cpp

@@ -3,7 +3,6 @@
 // Purpose:     Test for wxUniChar class
 // Author:      Vaclav Slavik
 // Created:     2007-03-11
-// RCS-ID:      $Id$
 // Copyright:   (c) 2007 REA Elektronik GmbH
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////

tests/strings/unicode.cpp

@@ -3,7 +3,6 @@
 // Purpose:     Unicode unit test
 // Author:      Vadim Zeitlin, Wlodzimierz ABX Skiba
 // Created:     2004-04-28
-// RCS-ID:      $Id$
 // Copyright:   (c) 2004 Vadim Zeitlin, Wlodzimierz Skiba
 ///////////////////////////////////////////////////////////////////////////////
 

tests/strings/vararg.cpp

@@ -3,7 +3,6 @@
 // Purpose:     Test for wx vararg look-alike macros
 // Author:      Vaclav Slavik
 // Created:     2007-02-20
-// RCS-ID:      $Id$
 // Copyright:   (c) 2007 REA Elektronik GmbH
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////

tests/strings/vsnprintf.cpp

@@ -5,7 +5,6 @@
 //              (part of this file was taken from CMP.c of TRIO package
 //               written by Bjorn Reese and Daniel Stenberg)
 // Created:     2006-04-01
-// RCS-ID:      $Id$
 // Copyright:   (c) 2006 Francesco Montorsi, Bjorn Reese and Daniel Stenberg
 ///////////////////////////////////////////////////////////////////////////////