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/Base/InfoView/aes_base_info.cpp

@@ -4,7 +4,7 @@
 #include <Plugins/ProjectDataManagement/pdm_data_plugin_interface.h>
 #include <ParticipantManagement/ppm_data_plugin_interface.h>
 #include <LtsSession/lts_session.h>
-#include <QDateTime>
+#include <QtCore/QDateTime>
 #include <AreaEffectSimulation/aes_translation.h>
 #include <ParticipantManagement/ppm_translation.h>
 

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Base/aes_base_edit.cpp

@@ -10,8 +10,8 @@
 #include <Plugins/AreaEffectSimulation/aes_data_plugin_interface.h>
 #include <Plugins/ExerciseManagement/exm_data_plugin_interface.h>
 #include <Plugins/SituationMapPlugin/situation_map_gui_plugin_interface.h>
-#include <QJsonDocument>
-#include <QSpinBox>
+#include <QtCore/QJsonDocument>
+#include <QtWidgets/QSpinBox>
 
 namespace AreaEffectSimulation
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Base/aes_base_model.h

@@ -13,8 +13,8 @@
 #include <AreaEffectSimulation/logger.h>
 #include <ProjectDataManagement/pdm_translation.h>
 
-#include <QSet>
-#include <QVector>
+#include <QtCore/QSet>
+#include <QtCore/QVector>
 
 #include <LtsWidgets/lts_abstract_table_model.h>
 #include <LtsWidgets/lts_column_filter_proxy_model.h>

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Base/aes_itemlist.cpp

@@ -11,10 +11,10 @@
 #include <PluginInterfaces/gui_plugin_interface.h>
 #include <Plugins/AreaEffectSimulation/aes_data_plugin_interface.h>
 #include <Plugins/SituationMapPlugin/situation_map_gui_plugin_interface.h>
-#include <QCheckBox>
-#include <QJsonDocument>
-#include <QKeyEvent>
-#include <QTreeView>
+#include <QtWidgets/QCheckBox>
+#include <QtCore/QJsonDocument>
+#include <QtGui/QKeyEvent>
+#include <QtWidgets/QTreeView>
 #include <Viewer/LtsDataView/lts_data_view.h>
 
 static const auto ADLER_BTN = LtsWidgets::DialogButton::Export;

qt6-after/qt6-migrated-legatus/Lts/Plugins/AreaEffectSimulation/Gui/Base/aes_pixmap_label.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include <QLabel>
+#include <QtWidgets/QLabel>
 #include <QPolygonF>
 #include "aes_base_exports.h"
 #include <AreaEffectSimulation/aes_enums.hpp>