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/CentralEffectSimulation/Plugins/Buildings/ces_building_model.cpp

@@ -15,8 +15,8 @@
 
 #include <float.h>
 
-#include <QLineF>
-#include <QDebug>
+#include <QtCore/QLineF>
+#include <QtCore/QDebug>
 
 
 #if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Buildings/ces_building_model.h

@@ -15,7 +15,7 @@
 #include <InfrastructureManagement/ism.hpp>
 #include <LtsCoordTrans/lts_coord_trans.h>
 
-#include <QObject>
+#include <QtCore/QObject>
 #include <QPolygonF>
 
 using namespace CentralEffectSimulation;

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Buildings/handler_aes_data.cpp

@@ -13,9 +13,9 @@
 #include <CentralEffectSimulation/handler_building_data.h>
 
 #include <QPainterPath>
-#include <QPointF>
+#include <QtCore/QPointF>
 #include <QPolygonF>
-#include <QTimer>
+#include <QtCore/QTimer>
 #include <QTransform>
 
 #include <LtsUtils/dds_bitarray.h>

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Buildings/handler_aes_data.h

@@ -25,7 +25,7 @@
 #include <QtCore/QHash>
 #include <QtCore/QVector>
 #include <QPolygonF>
-#include <QTimer>
+#include <QtCore/QTimer>
 
 namespace LtsUtils
 {

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Buildings/handler_building_model.cpp

@@ -13,8 +13,8 @@
 
 #include <float.h>
 
-#include <QJsonDocument>
-#include <QJsonObject>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
 #include <QVector3D>
 
 // operator<<

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Buildings/handler_building_model.h

@@ -16,8 +16,8 @@
 
 #include <CentralEffectSimulation/dds_handler.h>
 
-#include <QObject>
-#include <QMap>
+#include <QtCore/QObject>
+#include <QtCore/QMap>
 
 
 namespace NGL

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Buildings/handler_building_ownership.cpp

@@ -10,8 +10,8 @@
 #include <LtsCoordTrans/lts_coord_trans.h>
 #include <ngldb/dbtransaction.h>
 
-#include <QJsonDocument>
-#include <QJsonObject>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
 
 
 namespace CesBuildings

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Buildings/plugin.cpp

@@ -10,7 +10,7 @@
 
 #include <CentralEffectSimulation/proxy_building.h>
 
-#include <QTimer>
+#include <QtCore/QTimer>
 
 namespace CesBuildings
 {

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Buildings/plugin.h

@@ -22,7 +22,7 @@
 #include <CentralEffectSimulation/handler_building_data.h>
 #include <DDS/DDSConnector/dds_connector.h>
 
-#include <QObject>
+#include <QtCore/QObject>
 
 
 namespace CesBuildings