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Add support for 'std::variant' in C++17. For C++17, if all the alternatives of a variant are formattable the variant is now also formattable. In addition 'std::monostate' is now formattable. Moves implementation into 'std.h', and tests into 'std-test.cc'. Avoid fold-expression since MSVC was crashing. Add section for 'fmt/std.h' in API-docs.