Make name checking case insensitive.

Co-authored-by: kamilprzyb <kamilprzybspam@wp.pl>

src/CNLoginServer.hpp

@@ -33,6 +33,7 @@ private:
     static bool isLoginDataGood(std::string login, std::string password);
     static bool isPasswordCorrect(std::string actualPassword, std::string tryPassword);
     static bool isAccountInUse(int accountId);
+    static bool isCharacterNameGood(std::string Firstname, std::string Lastname);
     //returns true if success
     static bool exitDuplicate(int accountId);
 public: