Don't use rvalue references when compiling with clang and an old libstdc++ as the latter doesn't provide std::move.

Return Writer instead of std::string in variadic overloads of Format for performance & consistency with non-variadic versions.

Add a script to configure build environment and run CMake when building with Microsoft SDK toolchain.

Move formatting functionality from BasicFormatter to BasicWriter & FormatPaser to simplify the implementation of standalone formatting methods.