Functionality needed for the tournament

Added leave_game so the coordinator can save the replay file of a game.

added 4 commits

• 82830d6c...5f558ce9 - 3 commits from branch starcraft-ai-course:master
• 59932c56 - Merge gitlab.liu.se:starcraft-ai-course/pycommandcenter

Compare with previous version

mentioned in commit a38dc9e1

merged