feat(user-sessions): introduce GameLobby and GameUtil for session management and code generation

knockoutwhistweb/app/model/sessions/PlayerSession.scala

@@ -1,5 +1,6 @@
 package model.sessions
 
+import de.knockoutwhist.player.AbstractPlayer
 import de.knockoutwhist.utils.events.SimpleEvent
 
 import java.util.UUID
@@ -8,6 +9,7 @@ trait PlayerSession {
   
   def id: UUID
   def name: String
+  def player: AbstractPlayer
   def updatePlayer(event: SimpleEvent): Unit
   
 }