Add support for std::wstring (wide string support for Windows) #24
Description
When defining an option with Value<std::wstring> it won't compile (opposed to std::string).
Seems like there are some operators that are in use with std::string that are non-existant in std::wstring.
This support is especially important with command line params that hold Unicode values, like paths with Unicode characters.
Would really appreciate it if you could add support :)
Thanks in advance!