shlwapi: Implemented StrToInt64ExA/W

[carlo.bramix at libero.it]

I improved the patch according to the suggestions that I received:
1) Removed the C++ style comment
2) Removed the WARN message
3) Added the tests for the new functions. The test has been run successfully 
on Ubuntu 11.10.

Sincerely

Carlo Bramini

>I tried to implement StrToInt64ExA/W as a reply to bug #27633
>I also corrected the comment in functions FormatInt() and FormatDouble() 
>because, according to MSDN, GetNumberFormat() returns the number of 
characters 
>written (or required) and not the number of bytes emitted:
>http://msdn.microsoft.com/en-us/library/windows/desktop/dd318110%28v=vs.85%
29.
>aspx
>I hope my first patch to WINE is correct and it could be useful.
>Sincerely,
>
>Carlo Bramini.
>

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