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/Common/LtsPluginManager/Ui/lts_plugin_manager_dialog.cpp

@@ -6,9 +6,9 @@
 #include "lts_plugin_manager_widget.h"
 #include "ui_lts_plugin_manager_dialog.h"
 
-#include <QCoreApplication>
-#include <QDebug>
-#include <QString>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QDebug>
+#include <QtCore/QString>
 
 namespace LtsPluginManager
 {

qt6-after/qt6-migrated-legatus/Lts/Common/LtsPluginManager/Ui/lts_plugin_manager_dialog.h

@@ -4,8 +4,8 @@
 #include "lts_plugin_manager_widget.h"
 #include "ltspluginmanager_export.h"
 
-#include <QDialog>
-#include <QObject>
+#include <QtWidgets/QDialog>
+#include <QtCore/QObject>
 
 namespace Ui
 {

qt6-after/qt6-migrated-legatus/Lts/Common/LtsPluginManager/Ui/lts_plugin_manager_widget.h

@@ -1,8 +1,8 @@
 
 
 #pragma once
-#include <QObject>
-#include <QWidget>
+#include <QtCore/QObject>
+#include <QtWidgets/QWidget>
 #include <lts_plugin_manager.h>
 
 namespace Ui

qt6-after/qt6-migrated-legatus/Lts/Common/LtsPluginManager/lts_plugin_loader.cpp

@@ -4,13 +4,13 @@
 
 #include <LtsAppDescriptor/lts_app_descriptor.h>
 #include <NGLLogger/NGLLoggerBootstrap.h>
-#include <QCoreApplication>
-#include <QDebug>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QDebug>
 #include <QDirIterator>
-#include <QFileInfo>
-#include <QJsonObject>
+#include <QtCore/QFileInfo>
+#include <QtCore/QJsonObject>
 #include <QMutableListIterator>
-#include <QPluginLoader>
+#include <QtCore/QPluginLoader>
 #include <utility>
 
 namespace LtsPluginManager

qt6-after/qt6-migrated-legatus/Lts/Common/LtsPluginManager/lts_plugin_loader.h

@@ -4,8 +4,8 @@
 
 #define PLUGIN_LOADER_VERSION 3
 
-#include <QMap>
-#include <QPair>
+#include <QtCore/QMap>
+#include <QtCore/QPair>
 #include <functional>
 #include <qglobal.h>
 

qt6-after/qt6-migrated-legatus/Lts/Common/LtsPluginManager/lts_plugin_manager.cpp

@@ -12,8 +12,8 @@
 #include <NGLLogger/NGLLoggerBootstrap.h>
 #include <PluginInterfaces/data_plugin_interface.h>
 #include <PluginInterfaces/gui_plugin_interface.h>
-#include <QDebug>
-#include <QTimer>
+#include <QtCore/QDebug>
+#include <QtCore/QTimer>
 #include <utility>
 
 namespace LtsPluginManager

qt6-after/qt6-migrated-legatus/Lts/Common/LtsPluginManager/lts_plugin_manager.h

@@ -7,11 +7,11 @@
 #include <LtsAppDescriptor/lts_app_descriptor.h>
 #include <LtsPluginManager/lts_plugin_loader.h>
 #include <ProjectConfig/project_defines.h>
-#include <QFlags>
-#include <QMap>
-#include <QObject>
-#include <QString>
-#include <QVector>
+#include <QtCore/QFlags>
+#include <QtCore/QMap>
+#include <QtCore/QObject>
+#include <QtCore/QString>
+#include <QtCore/QVector>
 
 namespace NGL
 {