#187 support compatible strings as an argument in basic_node ctors #188
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Currently, constructing a string scalar node requires exactly the same type as basic_node::string_type as an argument type.
This restriction had been forcing users to create a lot of boilerplate codes before this PR.
To resolve the issue, this PR have supported compatible strings, e.g., character arrays or std::string_view (only with C++17 or later), as an argument of the basic_node constructor.