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/Common/LtsVirtualKeyboard/LtsVirtualKeyboard.h

@@ -0,0 +1,103 @@
+/**
+  * @RDE_HEADER@
+  * Virtual Keyboard
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Patric Karwat, SLSE, 2018-06-07
+*/
+
+#pragma once
+
+#include "LtsKeyPushButton.h"
+#include <LtsVirtualKeyboard/ltsvirtualkeyboard_export.h>
+#include <LtsSession/lts_session.h>
+
+class QClipboard;
+class QLabel;
+class QLineEdit;
+class QSize;
+class QTextEdit;
+
+namespace LtsVirtualKeyboard
+{
+
+class LTSVIRTUALKEYBOARD_EXPORT LtsVirtualKeyboard : public QWidget //public LtsWidgets::LtsDialog
+{
+  Q_OBJECT
+
+
+private:
+  LtsVirtualKeyboard(LtsSession::LtsSession *session, QWidget *activeForm = nullptr, bool onlyNumericPad = false, QWidget *parent = nullptr);
+  ~LtsVirtualKeyboard();
+
+public:
+  static LtsVirtualKeyboard *getInstance(LtsSession::LtsSession *session, QWidget *activeForm = nullptr, bool onlyNumericPad = false, QWidget *parent = nullptr);
+  static void cleanupLtsVirtualKeyboard();
+
+  void            createKeyboard();
+  bool            statusEchoMode() const { return (m_echoMode); }
+  void            setStatusEchoMode(bool echo) { m_echoMode = echo; }
+  void            receiptChildKey(QWidget *focusThisControl = nullptr, QKeyEvent *event = nullptr, bool reset = false);
+  void            switchKeyEchoMode(QWidget *control);
+  void            enableSwitchingEcho(bool status); // if you don't want control echo from keyboard
+  bool            isEnabledSwitchingEcho() const; // current status
+  void            borderFrame(bool visible = true);
+  void            checkInput();
+  QWidget        *setDefaultTextStyle(QWidget *control);
+  bool            isNumericPad() const;
+  QLabel         *zoomedWidget();
+  void            setActiveWindw(QWidget *widget) { m_activeWindow = widget; }
+  void            setSession(LtsSession::LtsSession *session) { m_session= session; }
+
+
+  //void retranslate() override;
+
+
+public slots:
+  void            show(QWidget *first = nullptr, bool frameless = false);
+  void            hide(bool changeColor);
+  void            focusThis(QWidget *control, bool numpad = false);
+
+protected:
+  void            closeEvent(QCloseEvent *event) override;
+
+private:
+  QSize             availableDesktopSize() const;
+  void              init_keyboard(QWidget *focusThisControl);
+  QWidget          *setCurrentTextStyle(QWidget *control);
+  LtsKeyPushButton *createNewKey(const QString &keyValue, const QString &notTranslatedValue, const QString &notTranslatedValueAlt = QString());
+  QWidget          *getNextTextbox(QWidget *thisControl = nullptr, bool reset = false);
+  void              controlKeyEcho(QWidget *control);
+  void              setTextToCurrentWidget(const QString &text);
+  QString           getTextFromCurrentWidget();
+  QString           getCurretText()const;
+  void              setCurrentText(const QString &text);
+  int               getCurrentTextCursorPosition();
+  void              setCurrentTextCursorPosition(int cursor);
+  bool              hasSelection() const;
+  QString           getSelectedText() const;
+  int               getSelectionStart() const;
+  void              reinit();
+private:
+
+  QTextEdit  *m_te;
+  QLineEdit  *m_le;
+
+  QWidget    *m_nextInput;
+  QWidget    *m_activeWindow;
+  bool        m_echoMode; // status of current text object for echo
+  bool        m_enablePasswordEcho;
+  bool        m_numericPad;
+  bool        m_isAlt;
+  bool        m_isCap;
+  bool        m_enableEnter;
+  bool        m_ready;
+
+  int m_height;
+  QClipboard *m_clipboard;
+  LtsSession::LtsSession *m_session;
+
+};
+
+} //namespace LtsVirtualKeyboard