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/AudioVideoManagement/Shared/avs_app.cpp

@@ -5,16 +5,16 @@
 #include <AudioVideoManagement/ava_control.h>
 #include <LtsMultiMonitor/lts_dummy_widget.h>
 #include <LtsMultiMonitor/lts_multi_monitor.h>
-#include <QGuiApplication>
-#include <QScreen>
-#include <QPoint>
+#include <QtGui/QGuiApplication>
+#include <QtGui/QScreen>
+#include <QtCore/QPoint>
 #include <QtGlobal>
 
 
 
 
 
-#include <QDebug>
+#include <QtCore/QDebug>
 
 
 

qt6-after/qt6-migrated-legatus/Lts/Plugins/AudioVideoManagement/Shared/avs_app.h

@@ -4,8 +4,8 @@
 #pragma once
 
 #include <avmshared_export.h>
-#include <QObject>
-#include <QRect>
+#include <QtCore/QObject>
+#include <QtCore/QRect>
 #include <boost/optional.hpp>
 
 namespace LtsMultiMonitor

qt6-after/qt6-migrated-legatus/Lts/Plugins/AudioVideoManagement/Shared/playback_app.h

@@ -4,8 +4,8 @@
 #pragma once
 
 #include <avmshared_export.h>
-#include <QString>
-#include <QObject>
+#include <QtCore/QString>
+#include <QtCore/QObject>
 #include <memory>
 #include <functional>
 

qt6-after/qt6-migrated-legatus/Lts/Plugins/AudioVideoManagement/Shared/plugin_settings.cpp

@@ -6,7 +6,7 @@
 #include <nglsettings/nglsettings_connections.h>
 #include <ngltools/ngltools_filesystem.h>
 #include <QtGlobal>
-#include <QSettings>
+#include <QtCore/QSettings>
 
 
 namespace

qt6-after/qt6-migrated-legatus/Lts/Plugins/AudioVideoManagement/Shared/plugin_settings.h

@@ -4,7 +4,7 @@
 #pragma once
 
 #include <avmshared_export.h>
-#include <QString>
+#include <QtCore/QString>
 #include <memory>
 #include <chrono>
 

qt6-after/qt6-migrated-legatus/Lts/Plugins/AudioVideoManagement/Shared/project_settings.cpp

@@ -3,8 +3,8 @@
 
 #include "project_settings.h"
 #include <LtsUtilsSettings/settings.h>
-#include <QString>
-#include <QVariant>
+#include <QtCore/QString>
+#include <QtCore/QVariant>
 
 namespace
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/AudioVideoManagement/Shared/stream_list_result.cpp

@@ -1,6 +1,6 @@
 #include "stream_list_result.h"
 
-#include <QMap>
+#include <QtCore/QMap>
 
 namespace AudioVideoManagement {
 

qt6-after/qt6-migrated-legatus/Lts/Plugins/AudioVideoManagement/Shared/stream_list_result.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <QObject>
+#include <QtCore/QObject>
 #include <AudioVideoManagement/ava_types.h>
 #include <avmshared_export.h>