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/Z/src/nglcompression/nglcomp_bzip2iodevice.cpp

@@ -2,8 +2,8 @@
 
 #include "nglcomp_bzip2iodevice.h"
 
-#include <QIODevice>
-#include <QString>
+#include <QtCore/QIODevice>
+#include <QtCore/QString>
 #include <bzlib.h>
 
 class BZip2IODevice::Private

qt6-after/qt6-migrated-legatus/Z/src/nglcompression/nglcomp_bzip2iodevice.h

@@ -6,8 +6,8 @@
 #ifndef BZIP2IODEVICE_H
 #define BZIP2IODEVICE_H
 
-#include <QString>
-#include <QIODevice>
+#include <QtCore/QString>
+#include <QtCore/QIODevice>
 
 
 

qt6-after/qt6-migrated-legatus/Z/src/nglcompression/nglcomp_compress.cpp

@@ -6,14 +6,14 @@
 #include "nglcomp_tarfilter.h"
 
 #include <NGLLogger/NGLLoggerBootstrap.h>
-#include <QBuffer>
-#include <QCoreApplication>
-#include <QDebug>
-#include <QDir>
-#include <QFileInfo>
-#include <QFutureWatcher>
-#include <QIODevice>
-#include <QStringList>
+#include <QtCore/QBuffer>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QDebug>
+#include <QtCore/QDir>
+#include <QtCore/QFileInfo>
+#include <QtCore/QFutureWatcher>
+#include <QtCore/QIODevice>
+#include <QtCore/QStringList>
 #include <QtConcurrent>
 #include <memory>
 #include <utility>

qt6-after/qt6-migrated-legatus/Z/src/nglcompression/nglcomp_compress.h

@@ -6,11 +6,11 @@
 
 #include <NGLLogger/INGLLogger.h>
 
-#include <QByteArray>
-#include <QFuture>
-#include <QObject>
-#include <QString>
-#include <QVector>
+#include <QtCore/QByteArray>
+#include <QtCore/QFuture>
+#include <QtCore/QObject>
+#include <QtCore/QString>
+#include <QtCore/QVector>
 
 class QIODevice;
 class TarFilter;

qt6-after/qt6-migrated-legatus/Z/src/nglcompression/nglcomp_tarfilter.cpp

@@ -3,11 +3,11 @@
 
 
 
-#include <QBuffer>
-#include <QFile>
-#include <QIODevice>
-#include <QFileInfo>
-#include <QDateTime>
+#include <QtCore/QBuffer>
+#include <QtCore/QFile>
+#include <QtCore/QIODevice>
+#include <QtCore/QFileInfo>
+#include <QtCore/QDateTime>
 // Use UTF-8 conversions instead of QTextCodec (Qt6)
 
 #include <time.h>

qt6-after/qt6-migrated-legatus/Z/src/nglcompression/nglcomp_tarfilter.h

@@ -6,8 +6,8 @@
 #ifndef TARFILTER_H
 #define TARFILTER_H
 
-#include <QString>
-#include <QFile>
+#include <QtCore/QString>
+#include <QtCore/QFile>
 #include <functional>
 
 class QIODevice;

qt6-after/qt6-migrated-legatus/Z/src/nglcompression/nglcomp_test.cpp

@@ -9,7 +9,7 @@
 #include <nglapplication/nglcoreapplication.h>
 #include <NGLLogger/NGLLoggerBootstrap.h>
 
-#include <QtTest>
+#include <QtTest/QtTest>
 
 
 

qt6-after/qt6-migrated-legatus/Z/src/nglcompression/nglcomp_test.h

@@ -2,11 +2,11 @@
 
 #pragma once
 
-#include <QByteArray>
-#include <QHash>
-#include <QObject>
+#include <QtCore/QByteArray>
+#include <QtCore/QHash>
+#include <QtCore/QObject>
 #include <QTemporaryDir>
-#include <QTemporaryFile>
+#include <QtCore/QTemporaryFile>
 
 class nglcomp_test : public QObject
 {