added parser for modern argument parsing rules

* Added a split function that supports the modern (post VS 2005)
 argument parsing rules.

* Fixed a bug where mslex failed to raise "Unquoted CMD metacharacters".

* Added tests.

* Improved quoted strings to be somewhat easier to read.

.gitattributes

@@ -0,0 +1 @@
+tests/examples.csv filter=lfs diff=lfs merge=lfs -text

README.rst

@@ -29,9 +29,34 @@ functions -- split, quote, and join -- just like shlex.
 Windows Quoting
 ---------------
 
-These are excellent articles to read if you really want to face the
-sanity-melting reality buried under the surface of how windows passes command
-line arguments to your programs.   I recommend you read something else.
+Since time immemorial, windows quoting behavior has been strange.  Prior to
+(I think) Visual Studio 2005, it exhibited the extremely strange modulo 3
+periodic behavior which is emulated here in ``split_msvcrt()``.   Programs
+compiled with the C runtime from Visual Studio 2005 and later exhibit the
+somewhat less strange behavior emulated in ``split_ucrt()``.
+
+Microsoft still ships a dll called ``msvcrt.dll`` as part of Windows,
+for compatibility reasons.   And even though they have been very clear in
+their documentation that nobody should ever link against this dll, people
+still do, either for compatibility reasons of their own, or because it
+is universally available on any version of windows you might care about
+without needing to run an installer.   And ``msvcrt.dll`` preserves the
+extremely strange argument parsing behavior from prior to VS 2005.
+
+You can can download the latest version of `msys2`_ today and build an
+executable linking ``msvcrt.dll`` on Windows 11, and it will parse
+arguments like Windows 95.
+
+``mslex`` will produce quoted strings that will be parsed correctly by
+either modern C runtimes or by ``msvcrt.dll``.   When parsing, ``mslex``
+parses it both ways and raises an error if they disagree.   This can
+be overridden by passing ``ucrt=True`` or ``ucrt=False`` to ``split``.
+
+See also:
+
+* `Parsing C Command Line Arguments`_
+
+* `Windows is not a Microsoft Visual C/C++ Run-Time delivery channel`_
 
 * `How a Windows Program Splits Its Command Line Into Individual Arguments`_
 
@@ -43,10 +68,18 @@ line arguments to your programs.   I recommend you read something else.
 .. _`Everyone quotes command line arguments the wrong way`:
   https://blogs.msdn.microsoft.com/twistylittlepassagesallalike/2011/04/23/everyone-quotes-command-line-arguments-the-wrong-way/
 
+.. _`Windows is not a Microsoft Visual C/C++ Run-Time delivery channel`: https://devblogs.microsoft.com/oldnewthing/20140411-00/?p=1273
+
+.. _`msys2`: https://www.msys2.org/docs/environments/
+
+.. _`Parsing C Command Line Arguments`: https://learn.microsoft.com/en-us/cpp/c-language/parsing-c-command-line-arguments?view=msvc-170
+
 
 Automatic selection between mslex and shlex
 -------------------------------------------
 
 If you want to automatically use mslex on Windows, and shlex otherwise, check out the `oslex`_ package.
 
 .. _`oslex`: https://pypi.org/project/oslex/
+.. _`msvcrt`: https://devblogs.microsoft.com/oldnewthing/20140411-00/?p=1273
+.. _`UCRT`: https://learn.microsoft.com/en-us/cpp/porting/upgrade-your-code-to-the-universal-crt?view=msvc-170