Qt6 Migration: Complete migration with DDS/RTI support and build validation

Major Changes:
- Merged latest Qt5 devel content from dlbo (292 files changed, 7 new dirs)
- Consolidated forward-declarations and include folders
- Removed unneeded modules per Niklas' repo check list

Build System Fixes:
- Fixed CMake VERSION_GREATER syntax in ParticipantManagement/CMakeLists.txt
- Added VLC packages (libvlc-dev, vlc-plugin-base) to docker_build.sh
- Added PostgreSQL dev packages (libpq-dev, postgresql-server-dev-all) to Dockerfile
- Fixed locale warnings (ANSI_X3.4-1968 → C.UTF-8)
- Fixed ArcGIS SDK path warnings when BUILD_ARCGIS=OFF

Code Generation Fixes:
- Fixed IDL enum collisions (PortType→CorePortType/DdsutPortType, PdmEventType)
- Fixed Grantlee template svc_translation.cpp.grantlee:
  - Changed {{ idl_enum.name }}_def:: to {{ idl_enum.name }}::
  - Fixed .underlying() calls for C++11 scoped enums (enum class)
- Removed generated files from repo (moc_*, *_dtc.h, *_ftc.h)

Validation:
- BUILD_RTI=ON: SUCCESS
- BUILD_RTI=OFF: SUCCESS
- C++17 standard maintained for RTI 7.7 compatibility
- Ubuntu 26.04 Docker environment verified

Remaining Warnings (expected):
- BgViewer, KDChart, KDReports, Poppler-Qt6 not found (optional features)

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

qt5-before/dlbo/Lts/Plugins/AudioVideoManagement/Shared/playback_app.cpp

@@ -0,0 +1,102 @@
+/**
+  * @RDE_HEADER@
+  * PlaybackApp
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Fröbel, NLSE, 2018-04-18
+  */
+
+#include "playback_app.h"
+#include "avs_app.h"
+
+#include <AudioVideoManagement/avs_dialog.h>
+#include <QtGlobal>
+
+
+namespace AudioVideoManagement
+{
+
+PlaybackApp::PlaybackApp(const QString &dialogId, AvaControl *avaControl, AppType appType)
+  : m_dialogId(dialogId)
+  , m_autoHide(appType == AppType::AutoHide)
+{
+  if (appType != AppType::AlwaysHidden)
+  {
+    m_app.reset(new AvsApp(m_dialogId, avaControl));
+    m_objectWrapper = new ObjectWrapper(nullptr);
+    QObject::connect(m_app.get(), &AvsApp::signalVisible,
+                     m_objectWrapper, &ObjectWrapper::signalVisible);
+    QObject::connect(m_app.get(), &AvsApp::signalPause,
+                     m_objectWrapper, &ObjectWrapper::signalPause);
+    QObject::connect(m_app.get(), &AvsApp::signalResume,
+                     m_objectWrapper, &ObjectWrapper::signalResume);
+  }
+}
+
+PlaybackApp::~PlaybackApp()
+{
+  if (m_objectWrapper)
+    m_objectWrapper->deleteLater();
+}
+
+void PlaybackApp::acquire()
+{
+  Q_ASSERT(!m_inUse);
+  if (m_app)
+    m_app->show();
+  m_inUse = true;
+}
+
+void PlaybackApp::setGeometry(const QRect &geometry)
+{
+  Q_ASSERT(m_app);
+  m_app->show(geometry);
+}
+
+void PlaybackApp::acquire(const QRect &geometry)
+{
+  Q_ASSERT(!m_inUse);
+  setGeometry(geometry);
+  m_inUse = true;
+}
+
+void PlaybackApp::release()
+{
+  Q_ASSERT(m_inUse);
+
+  // Hint: when m_autoHide == true, m_app is set.
+  // Otherwise (appType == Normal or AlwaysHidden) m_app might not be set (when appType == AlwaysHidden).
+  if (m_autoHide)
+    m_app->hide(true /* and close */); // implicitly releases all streams
+  else if (m_app)
+    m_app->releaseStreams();
+  m_inUse = false;
+}
+
+void PlaybackApp::hide(bool andClose)
+{
+  Q_ASSERT(m_inUse);
+
+  if (m_app)
+    m_app->hide(andClose);
+}
+
+
+
+// PlaybackAppHandle
+PlaybackAppHandle::PlaybackAppHandle(PlaybackApp *app)
+  : m_app(app, [] (PlaybackApp *app_) { app_->release(); })
+{
+  Q_ASSERT(app);
+  app->acquire();
+}
+
+PlaybackAppHandle::PlaybackAppHandle(PlaybackApp *app, const QRect &geometry)
+  : m_app(app, [] (PlaybackApp *app_) { app_->release(); })
+{
+  Q_ASSERT(app);
+  app->acquire(geometry);
+}
+
+} // namespace AudioVideoManagement