Qt6 migration: Fix BUILD_RTI=OFF build errors in TrainingAreaBase

- training_area_telegrams.cpp: Fixed QJsonObject initializer syntax (Qt6 requires {{}} not ({}))
- training_area_telegrams.cpp: Fixed fromJson() methods to access m_* members directly
- training_area_telegrams.cpp: Fixed brace mismatches in multiple toJson() methods
- training_area_telegrams.h: Changed Header struct to public members for consistency
- tx_mixin.cpp: Fixed getEquipmentNumber() template for direct member access
- lts_coordinate.cpp: Added missing #include <iomanip>
- MIGRATION_STATUS.md: Added migration progress tracking document

C++17 constraint enforced due to RTI Connext DDS 7.7.0 incompatibility with C++20+

Build status: BUILD_RTI=OFF successful (0 errors, warnings only)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/handler_infrastructure_data.h

@@ -16,8 +16,8 @@
 #include <InfrastructureManagement/ism_dtc_types.h>
 #include <DDS/DTC/generic_dtc_impl.h>
 
-#include <QObject>
-#include <QHash>
+#include <QtCore/QObject>
+#include <QtCore/QHash>
 
 namespace MeteoDataManagement
 {

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/handler_meteo_data_unit.cpp

@@ -12,8 +12,8 @@
 #include "handler_infrastructure_data.h"
 #include "tcpweatherstation.h"
 #include "main_handler.h"
-#include <QJsonDocument>
-#include <QJsonObject>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
 
 using namespace MeteoDataManagement;
 

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/handler_meteo_data_units.h

@@ -8,7 +8,7 @@
 
 #pragma once
 
-#include <QMap>
+#include <QtCore/QMap>
 #include "handler_meteo_data_unit.h"
 #include "logger.h"
 

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/settings.h

@@ -6,7 +6,7 @@
   */
 
 #pragma once
-#include <QString>
+#include <QtCore/QString>
 
 namespace NGL
 {

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/tcpclimate.h

@@ -10,7 +10,7 @@
 
 #pragma once
 
-#include <QTimer>
+#include <QtCore/QTimer>
 
 #include "tcpsocket.h"
 

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/tcpsocket.cpp

@@ -8,7 +8,7 @@
 
 #include "tcpsocket.h"
 
-#include <QTimer>
+#include <QtCore/QTimer>
 #include <QHostInfo>
 //#include <sys/socket.h>   // used for keepalive
 //#include <netinet/tcp.h>  // used for keepalive

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/tcpsocket.h

@@ -8,7 +8,7 @@
 
 #pragma once
 
-#include <QTcpSocket>
+#include <QtNetwork/QTcpSocket>
 #include "logger.h"
 
 namespace MeteoDataManagement

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/tcpweatherstation.h

@@ -8,7 +8,7 @@
   */
 #pragma once
 
-#include <QObject>
+#include <QtCore/QObject>
 #include "logger.h"
 
 namespace MeteoDataManagement

qt6-after/qt6-migrated-legatus/Lts/Services/MeteoDataManagement/tcpwind.h

@@ -11,7 +11,7 @@
 
 #pragma once
 
-#include <QTimer>
+#include <QtCore/QTimer>
 
 #include "tcpsocket.h"