More template's to reduce code repetetion and simplify the code! [PATCH]

[shahzadlone]

Here is an example by @jonesmz the great!

template<typename ... STRING_T>
inline std::string string_concat(STRINGS_T && args)
{
    // make a new string in an optimal way that contains all of the argument strings concatenated together.
}

[jonesmz]

Fixed. 10-string_concat