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

modules/gamelib/const.lua

@@ -78,6 +78,7 @@ GameDiagonalAnimatedText = 34
 GameLoginPending = 35
 GameNewSpeedLaw = 36
 GameForceFirstAutoWalkStep = 37
+GameLoginUUID = 38
 
 TextColors = {
   red       = '#f55e5e', --'#c83200'