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/Tests/DatabaseInitialisation/create_views.sql

@@ -0,0 +1,20 @@
+-- # $Id$
+-- # $HeadURL$
+-- # $Author$
+
+-- View for showing exerciseState changes
+DROP VIEW IF EXISTS exm.getExerciseStateChanges;
+CREATE VIEW exm.getExerciseStateChanges AS
+(
+  SELECT e.name AS ex_name, e.id AS exercise_id, 
+         s1.id AS s1_id, es1.name || '-' || s1.exercise_state_id AS state_old,
+         s2.id AS s2_id, es2.name || '-' || s2.exercise_state_id AS state_new
+  FROM exm.exercise_state_change s1, exm.exercise_state_change s2,
+       exm.exercise_state es1, exm.exercise_state es2,
+       exm.exercise e
+  WHERE s2.id - 1 = s1.id
+    AND e.id = s1.exercise_id
+    AND es1.id = s1.exercise_state_id
+    AND es2.id = s2.exercise_state_id
+);
+