BUILD_RTI conditional fixes and Qt6 API updates

- cmake/FindRTI.cmake: Add INTERFACE placeholder targets when RTI not found
- cmake/FindRTI.cmake: Force BUILD_RTI=OFF when RTI not installed
- Lts/Common/LtsSession/CMakeLists.txt: Make LtsSessionDataDds conditional on BUILD_RTI
- Lts/Viewer/CMakeLists.txt: Make LtsDataView conditional on BUILD_RTI
- Lts/Plugins/*/CMakeLists.txt: 97 plugin files wrapped in BUILD_RTI conditionals
- cmake/NGLMacros.cmake: Fix NGL_ADD_BIG_RESOURCES macro (removed premature return())
- Multiple Qt6 API fixes: QLinkedList→std::list, QStringRef→QStringView, etc.
- BUILD_RTI_FIXES_SUMMARY.md: Comprehensive documentation of all fixes

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

qt6-after/qt6-migrated-legatus/include/Lts/Common/ProjectConfig/project_defines.h

@@ -0,0 +1,73 @@
+
+
+
+#pragma once
+
+#include <string>
+#include <ostream>
+
+namespace IDL
+{
+enum class PartitionType
+{
+  Any,          
+  Global,       
+  Exercise,     
+  AllExercises, 
+  Replay,       
+};
+
+inline std::string toStdString(PartitionType pt)
+{
+  switch (pt)
+  {
+  case PartitionType::Any:
+    return "Any";
+  case PartitionType::Global:
+    return "Global";
+  case PartitionType::Exercise:
+    return "Exercise";
+  case PartitionType::AllExercises:
+    return "AllExercises";
+  case PartitionType::Replay:
+    return "Replay";
+  }
+  return std::string("invalid:") + std::to_string(static_cast<int>(pt));
+}
+
+inline std::ostream& operator <<(std::ostream &o, PartitionType pt)
+{
+
+  switch (pt)
+  {
+  case PartitionType::Any:
+  case PartitionType::Global:
+  case PartitionType::Exercise:
+  case PartitionType::AllExercises:
+  case PartitionType::Replay:
+    return o << std::string("PartitionType::") + toStdString(pt);
+  default:
+    return o << std::to_string(static_cast<int>(pt));
+  }
+}
+
+
+
+inline std::string exercisePartition(int exerciseId)
+{
+  if (exerciseId < 0)
+    return { "ex_*" };
+  return std::string("ex_") + std::to_string(exerciseId);
+}
+
+
+
+inline std::string replayPartition(int partitionId)
+{
+  if (partitionId < 0)
+    return { "srp_*" };
+  return std::string("srp_") + std::to_string(partitionId);
+}
+
+} 
+