Fix a vulnerability in password encryption

* There was an error in the encryption used to save passwords,
  now it's really harder to decrypt the password from the config file
* Other minor changes

src/client/const.h

@@ -349,6 +349,7 @@ namespace Otc
         GameLoginPending = 35,
         GameNewSpeedLaw = 36,
         GameForceFirstAutoWalkStep = 37,
+        GameLoginUUID = 38,
         // 51-100 reserved to be defined in lua
         LastGameFeature = 101
     };