shlwapi: Implemented StrToInt64ExA/W

[carlo.bramix at libero.it]

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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