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/NmeaManagement/Gui/BatteryNotification/nme_battery_info_dialog.cpp

@@ -10,10 +10,10 @@
 #include <LtsWidgets/lts_message_dialog.h>
 #include <LtsWidgets/lts_base_layout_widget.h>
 
-#include <QCloseEvent>
-#include <QApplication>
-#include <QScreen>
-#include <QDebug>
+#include <QtGui/QCloseEvent>
+#include <QtWidgets/QApplication>
+#include <QtGui/QScreen>
+#include <QtCore/QDebug>
 
 namespace NmeaManagement
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/NmeaManagement/Gui/BatteryNotification/nme_battery_info_dialog.h

@@ -1,9 +1,9 @@
 #pragma once
 
 #include <PluginInterfaces/data_plugin_interface.h>
-#include <QDialog>
+#include <QtWidgets/QDialog>
 #include <QListWidgetItem>
-#include <QTimer>
+#include <QtCore/QTimer>
 #include <Proxies/TrainingAreaBase/tab_dtc.h>
 #include <Proxies/TrainingAreaBase/tab_ftc.h>
 

qt6-after/qt6-migrated-legatus/Lts/Plugins/NmeaManagement/Gui/BatteryNotification/nme_notification_gui_plugin.cpp

@@ -9,10 +9,10 @@
 #include <LtsSession/lts_session.h>
 #include <LtsNotification/lts_notification.h>
 #include <LtsWidgets/lts_base_layout_widget.h>
-#include <QCoreApplication>
-#include <QMessageBox>
-#include <QPainter>
-#include <QPixmap>
+#include <QtCore/QCoreApplication>
+#include <QtWidgets/QMessageBox>
+#include <QtGui/QPainter>
+#include <QtGui/QPixmap>
 
 
 namespace NmeaManagement

qt6-after/qt6-migrated-legatus/Lts/Plugins/NmeaManagement/Gui/BatteryNotification/nme_notification_gui_plugin.h

@@ -9,7 +9,7 @@
 #include <Proxies/TrainingAreaBase/tab_dtc.h>
 #include <Proxies/TrainingAreaBase/tab_ftc.h>
 
-#include <QTimer>
+#include <QtCore/QTimer>
 
 namespace LtsNotification
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/NmeaManagement/Gui/BatteryNotification/nme_shutdown_dialog.cpp

@@ -11,11 +11,11 @@
 #include <LtsWidgets/lts_message_dialog.h>
 #include <LtsWidgets/lts_base_layout_widget.h>
 
-#include <QCloseEvent>
-#include <QApplication>
+#include <QtGui/QCloseEvent>
+#include <QtWidgets/QApplication>
 #include <QDesktopWidget>
-#include <QScreen>
-#include <QDebug>
+#include <QtGui/QScreen>
+#include <QtCore/QDebug>
 
 
 NmeShutdownDialog::NmeShutdownDialog(const std::shared_ptr<TrainingAreaBase::Interface::Ftc> &tabFtc,

qt6-after/qt6-migrated-legatus/Lts/Plugins/NmeaManagement/Gui/BatteryNotification/nme_shutdown_dialog.h

@@ -5,7 +5,7 @@
 #include <Proxies/TrainingAreaBase/tab_ftc.h>
 
 #include <LtsWidgets/lts_frameless_dialog.h>
-#include <QDialog>
+#include <QtWidgets/QDialog>
 #include <QListWidgetItem>
 #include <LtsUtils/LtsUtilsGui/LtsUtilsGuiDds/request_helper.h>