SIGNAL/SLOT migration: lts_app_descriptor_editor.cpp and qsql_informix.cpp

- Migrated 12 SIGNAL/SLOT connections in lts_app_descriptor_editor.cpp to function-pointer syntax
  - clicked, editingFinished, pressed, textChanged signals
  - Added required includes: QListView, QLineEdit, QPushButton
- Migrated 2 SIGNAL/SLOT connections in qsql_informix.cpp to function-pointer syntax
  - timeout signal connections
- Added Qt5::Core5Compat dependency for QTextCodec support in Qt6
  - Updated CMakeLists.txt to link Qt6::Core5Compat

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

build-rti-off/Lts/Plugins/DeveloperTools/Gui/devguiplugin_export.h

@@ -0,0 +1,43 @@
+
+#ifndef DEVGUIPLUGIN_EXPORT_H
+#define DEVGUIPLUGIN_EXPORT_H
+
+#ifdef DEVGUIPLUGIN_STATIC_DEFINE
+#  define DEVGUIPLUGIN_EXPORT
+#  define DEVGUIPLUGIN_NO_EXPORT
+#else
+#  ifndef DEVGUIPLUGIN_EXPORT
+#    ifdef DevGuiPlugin_EXPORTS
+        /* We are building this library */
+#      define DEVGUIPLUGIN_EXPORT __attribute__((visibility("default")))
+#    else
+        /* We are using this library */
+#      define DEVGUIPLUGIN_EXPORT __attribute__((visibility("default")))
+#    endif
+#  endif
+
+#  ifndef DEVGUIPLUGIN_NO_EXPORT
+#    define DEVGUIPLUGIN_NO_EXPORT __attribute__((visibility("hidden")))
+#  endif
+#endif
+
+#ifndef DEVGUIPLUGIN_DEPRECATED
+#  define DEVGUIPLUGIN_DEPRECATED __attribute__ ((__deprecated__))
+#endif
+
+#ifndef DEVGUIPLUGIN_DEPRECATED_EXPORT
+#  define DEVGUIPLUGIN_DEPRECATED_EXPORT DEVGUIPLUGIN_EXPORT DEVGUIPLUGIN_DEPRECATED
+#endif
+
+#ifndef DEVGUIPLUGIN_DEPRECATED_NO_EXPORT
+#  define DEVGUIPLUGIN_DEPRECATED_NO_EXPORT DEVGUIPLUGIN_NO_EXPORT DEVGUIPLUGIN_DEPRECATED
+#endif
+
+/* NOLINTNEXTLINE(readability-avoid-unconditional-preprocessor-if) */
+#if 0 /* DEFINE_NO_DEPRECATED */
+#  ifndef DEVGUIPLUGIN_NO_DEPRECATED
+#    define DEVGUIPLUGIN_NO_DEPRECATED
+#  endif
+#endif
+
+#endif /* DEVGUIPLUGIN_EXPORT_H */