Complete PrtCnv Qt6 migration so CoPrtCnv/PrtCnvLib/PrtCnv/ddsview build

Restore dropped m_logger members, QMutex->QRecursiveMutex, splitView->split, error->errorOccurred (migration-only, verified vs legacy).

qt6-after/qt6-migrated-legatus/TetraIF/PrtCnv/PrtCnvDbThread.cpp

@@ -43,13 +43,13 @@ PrtCnvDbThread::PrtCnvDbThread(const QString &dbDriver,
                                const QString &dbPassword,
                                PrtCnv::PrtCnvThreadStarter *a_parent)
   : PrtCnvThread(a_parent, "PrtCnvDbThread")
-  , m_BattleFieldOpStateMutex(QMutex::Recursive)
-  , m_MemberListByIdMutex(QMutex::Recursive)
-  , m_CentralListMutex(QMutex::Recursive)
+  , m_BattleFieldOpStateMutex()
+  , m_MemberListByIdMutex()
+  , m_CentralListMutex()
   , m_OldCentralAckCounter(0)
-  , m_RadioListMutex(QMutex::Recursive)
-  , m_SqlCmdListMutex(QMutex::Recursive)
-  , m_BroadcastMapMutex(QMutex::Recursive)
+  , m_RadioListMutex()
+  , m_SqlCmdListMutex()
+  , m_BroadcastMapMutex()
   , m_DoClean(false)
   , m_DoWaitUntilSqlWritten(false)
   , m_DoStorePermanent(false)