Fix FileManagement Build-Fehler (BUILD_RTI=OFF)

- flm_db.h: Stub-Header mit Folder/FileContent Klassen erstellt
- flm_enums.hpp: MainFolder Enum hinzugefügt (None=0)
- flm_translation.h: toInt() entfernt, trFolderName() angepasst
- Plugin-Interfaces erstellt (flm, opm, exm)
- Viewer-Dialogs: QString-Konvertierungen behoben
- AdvancedSymbology CMakeLists.txt: Ungültige Pfade entfernt
- ism_mounting_point.cpp: Redundante Definitionen entfernt

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

qt6-after/qt6-migrated-legatus/Lts/Viewer/LtsFileDialog/lts_dialog_model_file.cpp

@@ -88,7 +88,7 @@ QVariant DialogModelFile::data(const QModelIndex &index, int role) const
     switch (index.column())
     {
     case NAME:
-      return QString::fromStdString(fl.name());
+      return fl.name();
     case ISTEMPLATE:
       return fl.isTemplate() ? tr("Yes") : tr("No");
     case FOLDER:
@@ -110,7 +110,7 @@ QVariant DialogModelFile::data(const QModelIndex &index, int role) const
     case USES:
       return QString::fromStdString(fl.usedBy());
     case LASTMODIFIED:
-      return DTG::toStringMSec(fl.lastModified());
+      return DTG::toStringMSec(fl.lastModified().toMSecsSinceEpoch());
     case PROPERTIES:
       return QString::fromStdString(fl.properties());
     default:
@@ -136,7 +136,7 @@ int DialogModelFile::findFileIdFromName(const QString &fileName) const
   for (int row = 0; row < rc; ++row)
   {
     const FileManagement::FileContent &fl = this->getRowData(row);
-    if (QString::fromStdString(fl.name()) == fileName)
+    if (fl.name() == fileName)
     {
       return fl.id();
     }