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/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/XDR_QtHandler/XDR_DirHandler_ifc.h

@@ -3,9 +3,9 @@
 
 #pragma once
 
-#include <QObject>
-#include <QByteArray>
-#include <QString>
+#include <QtCore/QObject>
+#include <QtCore/QByteArray>
+#include <QtCore/QString>
 
 class XDR_DirHandlerIfc : public QObject
 {

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/XDR_QtHandler/XDR_DirHandler_linux.cpp

@@ -3,9 +3,9 @@
 
 #include "XDR_DirHandler_linux.h"
 
-#include <QMap>
-#include <QThread>
-#include <QTimer>
+#include <QtCore/QMap>
+#include <QtCore/QThread>
+#include <QtCore/QTimer>
 #include <QVarLengthArray>
 
 #include <poll.h>

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/XDR_QtHandler/XDR_DirHandler_linux.h

@@ -4,7 +4,7 @@
 #pragma once
 
 #include "XDR_DirHandler_ifc.h"
-#include <QMap>
+#include <QtCore/QMap>
 
 struct inotify_event;
 

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/convert_to_json_file.cpp

@@ -2,10 +2,10 @@
 
 
 #include "convert_to_json_file.h"
-#include <QJsonDocument>
-#include <QJsonObject>
-#include <QFile>
-#include <QDateTime>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
+#include <QtCore/QFile>
+#include <QtCore/QDateTime>
 #include <NGLLogger/NGLLoggerBootstrap.h>
 
 namespace TetraRadio

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/directory_cleaner.cpp

@@ -4,13 +4,13 @@
 #include "directory_cleaner.h"
 #include <NGLLogger/NGLLoggerBootstrap.h>
 #include <TrainingAreaBase/training_area_telegrams.h>
-#include <QDateTime>
-#include <QDir>
+#include <QtCore/QDateTime>
+#include <QtCore/QDir>
 #include <QDirIterator>
-#include <QTimer>
-#include <QThread>
-#include <QJsonDocument>
-#include <QJsonObject>
+#include <QtCore/QTimer>
+#include <QtCore/QThread>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
 #include <ctime>
 
 namespace TetraRadio

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/directory_cleaner.h

@@ -2,7 +2,7 @@
 
 #pragma once
 
-#include <QObject>
+#include <QtCore/QObject>
 #include <NGLLogger/INGLLogger.h>
 
 class QThread;

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/directory_dispatcher.cpp

@@ -5,7 +5,7 @@
 #include "convert_to_json_file.h"
 #include "directory_cleaner.h"
 #include <XDR_QtHandler/XDR_DirHandler.h>
-#include <QDir>
+#include <QtCore/QDir>
 
 namespace TetraRadio
 {

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/directory_dispatcher.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include <QObject>
+#include <QtCore/QObject>
 #include <TrainingAreaBase/tab_plugin_interface.h>
 #include <Core/core_types.h>
 #include "../TetraJson/convert_from_json.h"

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/plugin.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include <QObject>
+#include <QtCore/QObject>
 #include <TrainingAreaBase/tab_plugin_interface.h>
 
 namespace TetraRadio