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/SituationReplay/Gui/ReplayControl/TopicEditor/topic_editor.cpp

@@ -18,9 +18,9 @@
 
 
 
-#include <QDebug>
-#include <QJsonDocument>
-#include <QJsonObject>
+#include <QtCore/QDebug>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
 #include <QJsonParseError>
 #include <QtMath>
 

qt6-after/qt6-migrated-legatus/Lts/Plugins/SituationReplay/Gui/ReplayControl/replay_control_dialog.cpp

@@ -3,7 +3,7 @@
 
 #include "replay_control_dialog.h"
 
-#include <QHBoxLayout>
+#include <QtWidgets/QHBoxLayout>
 
 
 namespace SituationReplay

qt6-after/qt6-migrated-legatus/Lts/Plugins/SituationReplay/Gui/ReplayControl/replay_control_gui_plugin.cpp

@@ -12,7 +12,7 @@
 #include <PresentationManagement/Gui/Script/Common/TakeHomePackageGenerator/export.h>
 #include <Plugins/SituationMapPlugin/situation_map_script_filter_gui_plugin_interface.h>
 
-#include <QJsonDocument>
+#include <QtCore/QJsonDocument>
 
 
 namespace SituationReplay

qt6-after/qt6-migrated-legatus/Lts/Plugins/SituationReplay/Gui/ReplayControl/replay_control_gui_plugin.h

@@ -12,7 +12,7 @@
 #include <Plugins/MarkerManagement/mrk_gui_plugin_interface.h>
 #include <Plugins/SituationMapPlugin/situation_map_gui_plugin_interface.h>
 #include <MarkerManagement/Gui/Common/mrk_apply_filter.h>
-#include <QPointer>
+#include <QtCore/QPointer>
 
 
 namespace LtsScriptTimeline { class TopicEditor; }

qt6-after/qt6-migrated-legatus/Lts/Plugins/SituationReplay/Gui/ReplayControl/replay_control_widget.cpp

@@ -15,7 +15,7 @@
 #include <PluginInterfaces/gui_plugin_interface.h>
 #include <SituationMap/Map/operator_map_settings.h> 
 
-#include <QTimer>
+#include <QtCore/QTimer>
 
 
 namespace SituationReplay