[Client] Add tournament event plumbing and player extension points

Wires the client game layer for tournament state without touching
existing behavior:
- GameEventHandler dispatches Event_TournamentState (2027) to a new
  tournamentStateChanged signal
- GameMetaInfo exposes isTournament and parentGameId over the new
  ServerInfo_Game field
- PlayerEventHandler::processGameEvent is virtual and player is
  protected; PlayerLogic gains a protected constructor accepting a
  custom handler, so mode-specific subclasses can intercept events

cockatrice/src/game/player/player_logic.cpp

@@ -37,6 +37,19 @@ PlayerLogic::PlayerLogic(const ServerInfo_User &info, int _id, bool _local, bool
     initializeZones();
 }
 
+PlayerLogic::PlayerLogic(const ServerInfo_User &info,
+                         int _id,
+                         bool _local,
+                         bool _judge,
+                         AbstractGame *_parent,
+                         PlayerEventHandler *customEventHandler)
+    : QObject(_parent), game(_parent), playerInfo(new PlayerInfo(info, _id, _local, _judge)),
+      playerEventHandler(customEventHandler), playerActions(new PlayerActions(this)), active(false), conceded(false),
+      zoneId(0), dialogSemaphore(false)
+{
+    initializeZones();
+}
+
 void PlayerLogic::initializeZones()
 {
     addZone(new PileZoneLogic(this, ZoneNames::DECK, false, true, false, this));