Fix on some levels

All level seems to work before harder

All medium level can be play with world.py and patch for engine in near_exit is done.

Also add exit in level 00 from tutorial manually in level.py for waiting world.py can manage exit_y not found.

Change exit in password level because GUI and inferior are not on the same place.

Add exit in input_command via main.c by a "place_entity(EXIT).

Avoid monster too but I add a return in game.py when payload want to update an object who doesn't exist. We can do better than it directly in world.py by stop sending payload but objects when they are not in the current map