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/Plugins/AreaEffectSimulation/Gui/Explosion/aes_effector.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include <QWidget>
+#include <QtWidgets/QWidget>
 #include <AreaEffectSimulation/aes_enums.hpp>
 
 namespace Ui {

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Explosion/aes_explosion_edit.cpp

@@ -12,13 +12,13 @@
 #include <Plugins/SituationMapPlugin/situation_map_gui_plugin_interface.h>
 #include <PluginInterfaces/gui_plugin_interface.h>
 #include <Services/AreaEffectSimulation/Utils/polygons.h>
-#include <QJsonDocument>
+#include <QtCore/QJsonDocument>
 #include <LtsUtilsSettings/settings.h>
 
 #include <AdvancedSymbology/asb_data_plugin_interface.h>
 #include <ParticipantManagement/Gui/ParticipantSelection/participant_selection.h>
 
-#include <QSpinBox>
+#include <QtWidgets/QSpinBox>
 
 namespace AreaEffectSimulation
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Explosion/aes_explosion_gui_plugin.cpp

@@ -7,7 +7,7 @@
 #include "aes_explosions_edit.h"
 #include "aes_explosions_edit_adler.h"
 #include "aes_explosions_edit_adler_standalone.h"
-#include <QApplication>
+#include <QtWidgets/QApplication>
 #include <AreaEffectSimulation/aes_operator_rights.h>
 #include <LtsSession/lts_session.h>
 #include <LtsUtilsSettings/settings.h>

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Explosion/aes_explosions_edit.cpp

@@ -32,13 +32,13 @@
 
 #include <MathUtils/simple_helper.h>
 
-#include <QButtonGroup>
-#include <QDateTime>
-#include <QHash>
-#include <QJsonDocument>
-#include <QSpinBox>
-#include <QStandardItem>
-#include <QTimer>
+#include <QtWidgets/QButtonGroup>
+#include <QtCore/QDateTime>
+#include <QtCore/QHash>
+#include <QtCore/QJsonDocument>
+#include <QtWidgets/QSpinBox>
+#include <QtGui/QStandardItem>
+#include <QtCore/QTimer>
 
 namespace AreaEffectSimulation
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Explosion/aes_explosions_edit_adler.cpp

@@ -33,12 +33,12 @@
 #include <ExerciseManagement/exm_data_plugin_interface.h>
 #include <LtsElevation/lts_elevation_manager.h>
 
-#include <QButtonGroup>
-#include <QDateTime>
-#include <QHash>
-#include <QJsonDocument>
-#include <QSpinBox>
-#include <QTimer>
+#include <QtWidgets/QButtonGroup>
+#include <QtCore/QDateTime>
+#include <QtCore/QHash>
+#include <QtCore/QJsonDocument>
+#include <QtWidgets/QSpinBox>
+#include <QtCore/QTimer>
 
 namespace AreaEffectSimulation
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Explosion/aes_explosions_edit_adler_standalone.cpp

@@ -33,12 +33,12 @@
 
 #include <MathUtils/simple_helper.h>
 
-#include <QButtonGroup>
-#include <QDateTime>
-#include <QHash>
-#include <QJsonDocument>
-#include <QSpinBox>
-#include <QTimer>
+#include <QtWidgets/QButtonGroup>
+#include <QtCore/QDateTime>
+#include <QtCore/QHash>
+#include <QtCore/QJsonDocument>
+#include <QtWidgets/QSpinBox>
+#include <QtCore/QTimer>
 
 namespace AreaEffectSimulation
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Explosion/aes_rocket_utility.cpp

@@ -3,10 +3,10 @@
 
 #include "aes_rocket_utility.h"
 
-#include <QComboBox>
-#include <QJsonDocument>
-#include <QJsonObject>
-#include <QStandardItemModel>
+#include <QtWidgets/QComboBox>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
+#include <QtGui/QStandardItemModel>
 
 #include <AreaEffectSimulation/aes.hpp>
 #include <AreaEffectSimulation/Trajectory/trajectory_generator.h>