Tarot Game plugin: first draft

- SàT: beginning of the plugin
- Tarot Plugin: 1 method createTarotGame et 1 signal tarotGameStarted
- wix: added "Game" menu in group chat to start Tarot game

frontends/quick_frontend/quick_chat.py

@@ -30,7 +30,9 @@ class QuickChat():
         self.target = target
         self.host = host
         self.type = type
+        self.id = ""
         self.nick = None
+        self.occupants = set()
 
     def setType(self, type):
         """Set the type of the chat