Added functionality for 2 different players

- You now pass 2 different usercode files for two players.
- Running the simulation will actually update the field and robots! (so
you can actually run a game)
separated UI
Merge branch 'master' of https://github.com/mpeterv/rgsimulator
Made second player optional
Pulled upstream/master
Merge pull request #2 from afffsdd/master

Added functionality for 2 different players
Fixed having a dummy robot and removing dead bots
Merge pull request #3 from afffsdd/master

Fixed having a dummy robot and removing dead bots
Made the argument parsing a bit more logical
Merge pull request #4 from mueslo/patch-1

Made the argument parsing a bit more logical