Function merge_patch

include/behaviortree_cpp/contrib/json.hpp:24424–24448

@brief applies a JSON Merge Patch @sa https://json.nlohmann.me/api/basic_json/merge_patch/

    /// @brief applies a JSON Merge Patch
    /// @sa https://json.nlohmann.me/api/basic_json/merge_patch/
    void merge_patch(const basic_json& apply_patch)
    {
        if (apply_patch.is_object())
        {
            if (!is_object())
            {
                *this = object();
            }
            for (auto it = apply_patch.begin(); it != apply_patch.end(); ++it)
            {
                if (it.value().is_null())
                {
                    erase(it.key());
                }
                else
                {
                    operator[](it.key()).merge_patch(it.value());
                }
            }
        }
        else
        {
            *this = apply_patch;
        }
    }

    /// @}
};