utils: Pass by value where it makes sense

utils.cpp

@@ -84,7 +84,7 @@ std::string utils::urldecode(std::string_view str)
 	return result;
 }
 
-std::vector<std::string> utils::split(const std::string &str, char delim)
+std::vector<std::string> utils::split(std::string str, char delim)
 {
 	std::vector<std::string> result;
 	std::stringstream stream(str);
@@ -97,7 +97,7 @@ std::vector<std::string> utils::split(const std::string &str, char delim)
 }
 
 // TODO: can easily break if we pass a regex here
-std::vector<std::string> utils::split(const std::string &str, const std::string &delim)
+std::vector<std::string> utils::split(std::string str, const std::string &delim)
 {
 	std::regex regex{delim + "+"};
 	return split(str, regex);
@@ -112,7 +112,7 @@ std::vector<std::string> utils::split(const std::string &str, std::regex &regex)
 	return result;
 }
 
-std::string utils::strreplace(const std::string &str, const std::string &search, const std::string &replace)
+std::string utils::strreplace(std::string str, const std::string &search, const std::string &replace)
 {
 	std::string result = str;
 	auto searchlength = search.length();