Feature/chatbox

its okay. i tried to get autoscroll to bottom to work, but i couldn't

- press z to open chat box. type and press enter to send message. immediately closes chatbox.

would be nice if:
- received messages display automatically on screen (I would do this, if I could figure out why auto scroll to bottom would not work >_<

- turning needs to be disabled in multiple places, search DisableTurningHere and EnableTurningHere for those two locations. Basically, if turn left is being pressed when a menu is enterred, the turning keeps accelerating uncontrollably.