Kill game client if invalid sesstion

[cunhar]

Hey @Bstn1802 ,

https://github.com/Bstn1802/AutoReconnect/issues/57

This is my first ever modification on the client side of minecraft. I have an issue where my gameclient sometimes gets the tokens expired after runing for a while...

I added a few lines here to close the game. The game then will reopen because I have the https://github.com/mindstorm38/portablemc laucnher running on a while true.

Let me knw what you think and if this is something that could be added to the config section.

If you like it then I will continue to work on it.

<3 Hoobs