Core/Instances: Implemented confirmation dialog for players upon entering instance which would permanently bind the player to it, players can now choose to get saved or leave the instance

Also fixes broken build

src/server/game/Server/WorldSession.cpp

@@ -402,6 +402,11 @@ void WorldSession::LogoutPlayer(bool Save)
             _player->BuildPlayerRepop();
             _player->RepopAtGraveyard();
         }
+        else if (_player->HasPendingBind())
+        {
+            _player->RepopAtGraveyard();
+            _player->SetPendingBind(NULL, 0);
+        }
 
         //drop a flag if player is carrying it
         if (Battleground *bg = _player->GetBattleground())