[Client] Drop dead player event handler extension points

The second PlayerLogic constructor taking a custom PlayerEventHandler was UB
(converting this to PlayerLogic* in the base initializer, and connecting a
freshly-built handler against a not-yet-constructed object), and its abstract
extension surface — virtual initializeZones, virtual getPlayerEventHandler,
virtual processGameEvent, protected player member — has no subclass consumer in
the stack. Revert to the single primary constructor.

Also:
- Drop the unused GameMetaInfo::setIsTournament setter. Tournament status is
  authoritative from Event_GameJoined's ServerInfo_Game; the redundant
  is_tournament field on Event_GameStateChanged is removed in [Protocol].
- Gate the parent-game routing on has_parent_game_id() instead of comparing the
  proto default, so a future drop of the default keeps working.

libcockatrice_game/libcockatrice/game/player/player_event_handler.h

@@ -93,10 +93,10 @@ public:
      * @param context Additional context (undo, judge, etc.).
      * @param options Processing options (UI suppression, reveal behavior).
      */
-    virtual void processGameEvent(GameEvent::GameEventType type,
-                                  const GameEvent &event,
-                                  const GameEventContext &context,
-                                  EventProcessingOptions options);
+    void processGameEvent(GameEvent::GameEventType type,
+                          const GameEvent &event,
+                          const GameEventContext &context,
+                          EventProcessingOptions options);
 
     /** @} */
 
@@ -277,7 +277,7 @@ signals:
      */
     void cardViewRefreshRequested(CardState *card, bool zoneChanged, PlayerLogic *newOwner);
 
-protected:
+private:
     /** Owning player instance. */
     PlayerLogic *player;