neutrino: sync keybind and usermenu code with neutrino-mp, code (C) martii

src/system/helpers.cpp

@@ -765,3 +765,56 @@ bool split_config_string(const std::string &str, std::map<std::string,std::strin
 	}
 	return !smap.empty();
 }
+
+std::vector<std::string> split(const std::string &s, char delim)
+{
+	std::vector<std::string> vec;
+	std::stringstream ss(s);
+	std::string item;
+	while (std::getline(ss, item, delim))
+		vec.push_back(item);
+	return vec;
+}
+
+std::string to_string(int i)
+{
+	std::stringstream s;
+	s << i;
+	return s.str();
+}
+
+std::string to_string(unsigned int i)
+{
+	std::stringstream s;
+	s << i;
+	return s.str();
+}
+
+std::string to_string(long i)
+{
+	std::stringstream s;
+	s << i;
+	return s.str();
+}
+
+std::string to_string(unsigned long i)
+{
+	std::stringstream s;
+	s << i;
+	return s.str();
+}
+
+std::string to_string(long long i)
+{
+	std::stringstream s;
+	s << i;
+	return s.str();
+}
+
+std::string to_string(unsigned long long i)
+{
+	std::stringstream s;
+	s << i;
+	return s.str();
+}
+