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/Common/LtsAppDescriptor/checker/main.cpp

@@ -1,11 +1,11 @@
 #include <LtsAppDescriptor/lts_app_descriptor.h>
-#include <QCoreApplication>
+#include <QtCore/QCoreApplication>
 #include <QDirIterator>
-#include <QFile>
+#include <QtCore/QFile>
 #include <QFileInfoList>
-#include <QRegularExpression>
-#include <QRegularExpressionMatch>
-#include <QTextStream>
+#include <QtCore/QRegularExpression>
+#include <QtCore/QRegularExpressionMatch>
+#include <QtCore/QTextStream>
 #include <cstdio>
 #include <utility>
 

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppDescriptor/lts_app_descriptor.cpp

@@ -2,12 +2,12 @@
 
 #include "lts_app_descriptor.h"
 
-#include <QCoreApplication>
-#include <QJsonArray>
-#include <QJsonDocument>
-#include <QJsonObject>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QJsonArray>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
 #include <QJsonParseError>
-#include <QJsonValue>
+#include <QtCore/QJsonValue>
 
 namespace LtsAppDescriptor
 {

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppDescriptor/lts_app_descriptor.h

@@ -2,8 +2,8 @@
 
 #pragma once
 
-#include <QStringList>
-#include <QVector>
+#include <QtCore/QStringList>
+#include <QtCore/QVector>
 
 #ifndef LTSAPPDESCRIPTOR_EXPORT
 #ifdef BUILD_STATIC_LIBRARIES

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppDescriptor/lts_app_descriptor_editor.cpp

@@ -2,13 +2,13 @@
 
 #include "ui_lts_app_descriptor_editor.h"
 
-#include <QDebug>
-#include <QFile>
-#include <QFileDialog>
-#include <QJsonDocument>
-#include <QMessageBox>
+#include <QtCore/QDebug>
+#include <QtCore/QFile>
+#include <QtWidgets/QFileDialog>
+#include <QtCore/QJsonDocument>
+#include <QtWidgets/QMessageBox>
 #include <QStringListModel>
-#include <QTimer>
+#include <QtCore/QTimer>
 
 LtsAppDescriptorEditor::LtsAppDescriptorEditor(QWidget* parent) : QWidget(parent), m_ui(new Ui_LtsAppDescriptionEditor)
 {

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppDescriptor/lts_app_descriptor_editor.h

@@ -1,8 +1,8 @@
 #pragma once
 #include "lts_app_descriptor.h"
 
-#include <QModelIndex>
-#include <QObject>
+#include <QtCore/QModelIndex>
+#include <QtCore/QObject>
 #include <QtWidgets/QWidget>
 
 #ifndef LTSAPPDESCRIPTOREDITOR_EXPORT

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppDescriptor/main.cpp

@@ -2,10 +2,10 @@
 
 #include "lts_app_descriptor_editor.h"
 
-#include <QAction>
-#include <QApplication>
-#include <QMainWindow>
-#include <QMenuBar>
+#include <QtGui/QAction>
+#include <QtWidgets/QApplication>
+#include <QtWidgets/QMainWindow>
+#include <QtWidgets/QMenuBar>
 
 int main(int argc, char* argv[])
 {