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/OperatorManagement/Gui/OperatorSettings/SettingsGroup/opm_settings_group.cpp

@@ -3,7 +3,7 @@
 
 #include "opm_settings_group.h"
 
-#include <QJsonDocument>
+#include <QtCore/QJsonDocument>
 #include <QJsonParseError>
 
 #include <LtsUtilsSettings/settings.h>

qt6-after/qt6-migrated-legatus/Lts/Plugins/OperatorManagement/Gui/OperatorSettings/SettingsGroup/opm_settings_group.h

@@ -3,8 +3,8 @@
 
 #pragma once
 
-#include <QJsonObject>
-#include <QVector>
+#include <QtCore/QJsonObject>
+#include <QtCore/QVector>
 #include <OperatorManagement/logger.h>
 
 namespace LtsUtils { class OperatorSettings; }

qt6-after/qt6-migrated-legatus/Lts/Plugins/OperatorManagement/Gui/OperatorSettings/operator_settings_create_new_dialog.cpp

@@ -4,7 +4,7 @@
 #include "operator_settings_create_new_dialog.h"
 #include "ui_operator_settings_create_new_dialog.h"
 #include <LtsWidgets/lts_message_dialog.h>
-#include <QComboBox>
+#include <QtWidgets/QComboBox>
 
 namespace OperatorManagement
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/OperatorManagement/Gui/OperatorSettings/operator_settings_dialog.cpp

@@ -21,13 +21,13 @@
 #include <OperatorManagement/opm_operator_rights.h>
 #include <ngltools/ngltools_dtg.h>
 
-#include <QBrush>
-#include <QFileDialog>
-#include <QKeyEvent>
-#include <QPainter>
-#include <QPen>
-#include <QTimer>
-#include <QUuid>
+#include <QtGui/QBrush>
+#include <QtWidgets/QFileDialog>
+#include <QtGui/QKeyEvent>
+#include <QtGui/QPainter>
+#include <QtGui/QPen>
+#include <QtCore/QTimer>
+#include <QtCore/QUuid>
 
 
 static const char* DISABLE_FAST_CLICKS_PROPERTY = "DisableFastClicks";

qt6-after/qt6-migrated-legatus/Lts/Plugins/OperatorManagement/Gui/OperatorSettings/operator_settings_dialog.h

@@ -12,8 +12,8 @@
 #include <LtsUtils/LtsUtilsGui/LtsUtilsGuiDds/request_helper.h>
 
 #include <QBasicTimer>
-#include <QPointer>
-#include <QLabel>
+#include <QtCore/QPointer>
+#include <QtWidgets/QLabel>
 
 enum LtsDate
 {

qt6-after/qt6-migrated-legatus/Lts/Plugins/OperatorManagement/Gui/OperatorSettings/opm_settings_gui_plugin.cpp

@@ -21,11 +21,11 @@
 
 #include <Common/LtsProjectionWorkstation/lts_projection_workstation.h>
 
-#include <QJsonArray>
-#include <QJsonDocument>
-#include <QJsonObject>
-#include <QUuid>
-#include <QTimer>
+#include <QtCore/QJsonArray>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
+#include <QtCore/QUuid>
+#include <QtCore/QTimer>
 
 namespace OperatorManagement
 {