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/Services/GuezMinelayerProcessing/UnitTests/gmp_minefieldInterpreter_test.cpp

@@ -9,8 +9,8 @@
 
 #include "gmp_minefieldInterpreter_test.h"
 
-#include <QCoreApplication>
-#include <QDateTime>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QDateTime>
 #include <QtTest/QTest>
 
 #include <NGLLogger/NGLLoggerBootstrap.h>

qt6-after/qt6-migrated-legatus/Lts/Services/GuezMinelayerProcessing/UnitTests/gmp_minefieldInterpreter_test.h

@@ -8,10 +8,10 @@
   */
 #pragma once
 
-#include <QObject>
-#include <QTimer>
+#include <QtCore/QObject>
+#include <QtCore/QTimer>
 #include <QSignalSpy>
-#include <QPair>
+#include <QtCore/QPair>
 
 #include "../zssi_wi_Minenfeld_Interpreter.h"
 

qt6-after/qt6-migrated-legatus/Lts/Services/GuezMinelayerProcessing/handler_minelayer_data.cpp

@@ -18,7 +18,7 @@
 #include "dds_handler.h"
 #include "zssi_wi_Minenfeld_Interpreter.h"
 
-#include <QLineF>
+#include <QtCore/QLineF>
 
 #if BUILD_RTI
 

qt6-after/qt6-migrated-legatus/Lts/Services/GuezMinelayerProcessing/handler_minelayer_data.h

@@ -8,9 +8,9 @@
   */
 #pragma once
 
-#include <QObject>
-#include <QPointF>
-#include <QTimer>
+#include <QtCore/QObject>
+#include <QtCore/QPointF>
+#include <QtCore/QTimer>
 
 #include <LtsCoordTrans/lts_coord_trans.h>
 #include <ParticipantManagement/ppm.hpp>

qt6-after/qt6-migrated-legatus/Lts/Services/GuezMinelayerProcessing/settings.h

@@ -6,7 +6,7 @@
   */
 
 #pragma once
-#include <QString>
+#include <QtCore/QString>
 #include "gmp_export.h"
 
 namespace NGL

qt6-after/qt6-migrated-legatus/Lts/Services/GuezMinelayerProcessing/zssi_wi_Minenfeld_Generator.cpp

@@ -46,7 +46,7 @@ static char rcs_id[] = "$Id$";
 
 //------------------ includes ------------------------------
 
-#include <QString>
+#include <QtCore/QString>
 
 #include <stdio.h>
 #include <iostream>

qt6-after/qt6-migrated-legatus/Lts/Services/GuezMinelayerProcessing/zssi_wi_Minenfeld_Generator.h

@@ -48,7 +48,7 @@
 #define ZSSI_WI_MINENFELD_GENERATOR_H
 
 /*------------------ includes ----------------------------*/
-#include <QObject>
+#include <QtCore/QObject>
 
 #include "GFS_map_cont.h"
 

qt6-after/qt6-migrated-legatus/Lts/Services/GuezMinelayerProcessing/zssi_wi_Minenfeld_Interpreter.h

@@ -45,7 +45,7 @@
 
 /*------------------ includes ----------------------------*/
 
-#include <QObject>
+#include <QtCore/QObject>
 
 #include "GFS_map_cont.h"
 #include "zssi_wi_Minenfeld_Generator.h"