Add Lts/Application module with Qt6 CMakeLists updates

- Copy Lts/Application from qt5-before (AarApp, OpApp, THP submodules)
- Update all CMakeLists.txt to use Qt6::Core, Qt6::Widgets, Qt6::Xml, Qt6::Network, Qt6::PrintSupport, Qt6::Svg, Qt6::WebEngineCore, Qt6::WebEngineWidgets
- No SIGNAL/SLOT, QRegExp, QDesktopWidget, or QTextCodec issues found in Application source code
- Module ready for Qt6 build validation

qt6-after/qt6-migrated-legatus/Lts/Application/AarApp/logger.cpp

@@ -0,0 +1,37 @@
+/**
+  * @RDE_HEADER@
+  * Building Config - logging facility
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#include "logger.h"
+
+#include <NGLLogger/NGLLoggerBootstrap.h>
+
+namespace AARApplication
+{
+
+LOGGER_T getLogger(const char *name)
+{
+  static const char ns[] = "DBA.";
+  std::string loggerName;
+  const size_t len = strlen(name);
+  loggerName.reserve(sizeof(ns) + len);
+  loggerName.append(ns, sizeof(ns) - 1);
+  loggerName.append(name, len);
+
+  try
+  {
+    return NGL::NGLLoggerBootstrap::getNGLRootLogger().
+           getNGLLogger(loggerName);
+  }
+  catch (const std::exception &ex)
+  {
+    fprintf(stderr, "Error retrieving logger: %s", ex.what());
+    abort();
+  }
+}
+
+} // namespace AARApplication