[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/game_event_handler.cpp

@@ -380,8 +380,9 @@ void GameEventHandler::eventGameStateChanged(const Event_GameStateChanged &event
                                              const GameEventContext & /*context*/)
 {
     // Sub-games of a tournament report their parent hub game so the client can
-    // route "close game" back to the parent tab.
-    if (event.parent_game_id() != -1) {
+    // route "close game" back to the parent tab. Use has_parent_game_id rather
+    // than comparing the default so a future drop of the proto default still works.
+    if (event.has_parent_game_id()) {
         game->getGameMetaInfo()->setParentGameId(event.parent_game_id());
     }