Implemented new e2e Tests and fixed mess

Jasmin Kufnerrequested to merge
e2e into master
  • Fixed the code mess in steps.py
  • Changed circle to o in game_elements.py
  • Implemented following e2e Tests:
  • Saving a game of "Player vs Player"
  • Saving a game of "Player vs AI"
  • Not Saving a game of "Player vs Player"
  • Not Saving a game of "Player vs AI"
  • Loading a game of "Player vs Player"
  • Loading a game of "Player vs AI"
  • Reverting last move

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