Add toUpperCase/toLowerCase free functions for std::string

Author: pepc84

src/Processing.h

@@ -1417,6 +1417,8 @@ inline bool        toBoolean(const ::std::string& s)  { return s=="true"||s=="1"
 inline int         toInt(const ::std::string& s)      { return ::std::stoi(s); }
 inline float       toFloat(const ::std::string& s)    { try { return ::std::stof(s); } catch (...) { return 0.0f; } }
 inline char        toChar(int v)                    { return static_cast<char>(v); }
+inline ::std::string toUpperCase(::std::string s) { for(auto& c:s) c=::std::toupper((unsigned char)c); return s; }
+inline ::std::string toLowerCase(::std::string s) { for(auto& c:s) c=::std::tolower((unsigned char)c); return s; }
 inline ::std::string trim(const ::std::string& s) {
     size_t a=s.find_first_not_of(" \t\n\r"), b=s.find_last_not_of(" \t\n\r");
     return a==::std::string::npos ? "" : s.substr(a, b-a+1);