[String] Port changes from S1x

src/Utils/String.cpp

@@ -23,16 +23,24 @@ namespace Utils
 			return result;
 		}
 
-		std::string ToLower(std::string input)
+		std::string ToLower(std::string text)
 		{
-			std::transform(input.begin(), input.end(), input.begin(), ::tolower);
-			return input;
+			std::transform(text.begin(), text.end(), text.begin(), [](const unsigned char input)
+			{
+				return static_cast<char>(std::tolower(input));
+			});
+
+			return text;
 		}
 
-		std::string ToUpper(std::string input)
+		std::string ToUpper(std::string text)
 		{
-			std::transform(input.begin(), input.end(), input.begin(), ::toupper);
-			return input;
+			std::transform(text.begin(), text.end(), text.begin(), [](const unsigned char input)
+			{
+				return static_cast<char>(std::toupper(input));
+			});
+
+			return text;
 		}
 
 		std::string DumpHex(const std::string& data, const std::string& separator)

src/Utils/String.hpp

@@ -75,8 +75,8 @@ namespace Utils
 		const char *VA(const char *fmt, ...);
 
 		int IsSpace(int c);
-		std::string ToLower(std::string input);
-		std::string ToUpper(std::string input);
+		std::string ToLower(std::string text);
+		std::string ToUpper(std::string text);
 		bool EndsWith(const std::string& haystack, const std::string& needle);
 		std::vector<std::string> Split(const std::string& str, const char delim);
 		void Replace(std::string& string, const std::string& find, const std::string& replace);