zombie.zip now optional

- You can now Die as a controlled survivor without losing your save or the game exiting. If your MAIN character dies, whether you controlling him or not, game will end.
- Survivors now have a chance to flee rather than attack a zombie depending on their panic level AND how many zombies are near by

fixed for local coop player cant see other coop players
survivors should run from large zombie groups rather than fight

increased s

restored settings file to default

fixed function definition conflict. Added error messages when certain files could not load