Remove StringUtils.hpp from Utils.hpp
/* Lean implementation of SLDC "Annex K" for non-Windows OS */
#include "annex_k.hpp"
-#include "utils/StringUtils.hpp"
-
#if (__cplusplus < 201402L) && !defined(_MSC_VER)
/* Workaround for lack of std::make_unique in C++11 (gcc-5). N3936 for C++14 support mentions 201402L */
#include <memory>
