Previous games library

[mirdukkkkk]

• [ ] Get current game (partially implemented in game api plugin)
  • [ ] #38
• [x] Changing game state (check /game/change)
• [ ] Endpoint showing previous games
• [x] Endpoint showing current game
• [ ] Frontend support (create issue)

will be supplemented

[mirdukkkkk]

at what milestone do we do it? v4 or...