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/Explosions/expand_polygon.h

@@ -9,7 +9,7 @@
 #pragma once
 
 #include <QPolygonF>
-#include <QString>
+#include <QtCore/QString>
 
 namespace CesExplosions
 {

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Explosions/handler_artillery_l.h

@@ -17,8 +17,8 @@
 //#include <CentralEffectSimulation/proxy_building.h>
 
 
-#include <QHash>
-#include <QVector>
+#include <QtCore/QHash>
+#include <QtCore/QVector>
 #include <QPolygonF>
 
 

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Explosions/handler_explosions.cpp

@@ -19,11 +19,11 @@
 #include <LtsCoordinate/lts_coordinate.h>
 
 
-#include <QPointF>
-#include <QVector>
-#include <QSet>
-#include <QDateTime>
-#include <QTimer>
+#include <QtCore/QPointF>
+#include <QtCore/QVector>
+#include <QtCore/QSet>
+#include <QtCore/QDateTime>
+#include <QtCore/QTimer>
 #include <QElapsedTimer>
 
 using namespace CentralEffectSimulation;

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Explosions/handler_explosions.h

@@ -27,7 +27,7 @@
 #include <QtCore/QVector>
 #include <QPolygonF>
 #include <QQueue>
-#include <QTimer>
+#include <QtCore/QTimer>
 
 // AES-Handling for Explosions
 

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Explosions/handler_vulcano.cpp

@@ -18,13 +18,13 @@
 #include <CentralEffectSimulation/handler_participant.h>
 
 #include <QPainterPath>
-#include <QPointF>
+#include <QtCore/QPointF>
 #include <QPolygonF>
-#include <QVector>
-#include <QTimer>
+#include <QtCore/QVector>
+#include <QtCore/QTimer>
 #include <QTransform>
-#include <QDateTime>
-#include <QVariant>
+#include <QtCore/QDateTime>
+#include <QtCore/QVariant>
 
 
 namespace CesExplosions

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Explosions/handler_vulcano.h

@@ -23,8 +23,8 @@
 #include <QtCore/QVector>
 #include <QPolygonF>
 #include <QQueue>
-#include <QHash>
-#include <QTimer>
+#include <QtCore/QHash>
+#include <QtCore/QTimer>
 
 namespace LtsUtils
 {

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Explosions/line_of_sight.h

@@ -11,7 +11,7 @@
 #include <LtsCoordinate/lts_coordinate.h>
 #include <CentralEffectSimulation/proxy_building.h>
 
-#include <QFlags>
+#include <QtCore/QFlags>
 #pragma once
 
 namespace CesExplosions

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

@@ -17,7 +17,7 @@
 #include <CentralEffectSimulation/dds_handler.h>
 #include <DDS/DDSConnector/dds_connector.h>
 
-#include <QObject>
+#include <QtCore/QObject>
 
 
 namespace CesExplosions

qt6-after/qt6-migrated-legatus/Lts/Services/CentralEffectSimulation/Plugins/Explosions/settings.h

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