Function make_reference_userdata

include/sol/make_reference.hpp:53–60

	template <typename R = reference, bool should_pop = !is_stack_based_v<R>, typename T>
	R make_reference_userdata(lua_State* L, T&& value) {
		int backpedal = stack::push_userdata(L, std::forward<T>(value));
		R r = stack::get<R>(L, -backpedal);
		if (should_pop) {
			lua_pop(L, backpedal);
		}
		return r;
	}

	template <typename T, typename R = reference, bool should_pop = !is_stack_based_v<R>, typename... Args>
	R make_reference_userdata(lua_State* L, Args&&... args) {