Add different bots for more fun

[abc013]

add player-bots which should do:

• : run around
• : attack Players
• : run away from players
• : detect Lava etc.
  • : go around it

I have the idea that different bots have different acting, f. e. a Turtle Bot, who escapes from other Players and just keep alive, a Attack bot who just wants to kill everyone, and don't consider sourness (and, later, water).
In the options menu should be a list for if the specific Player is a bot (when yes, what bot) or not.