Add flm_data_plugin_interface.h stub

- Plugin Interface Header für FileManagement Data Plugin
- Benötigt für LtsFileDialog Build (BUILD_RTI=OFF)
- Vom Qt5-Quellcode kopiert und angepasst

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

qt6-after/qt6-migrated-legatus/Lts/Plugins/FileManagement/flm_data_plugin_interface.h

@@ -0,0 +1,30 @@
+/**
+  * @RDE_HEADER@
+  * FileManagement Explorer Interface for access from other Plugins
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Mike Wille, SLSE, 2017-03-31
+  */
+
+#pragma once
+
+#include <PluginInterfaces/data_plugin_interface.h>
+#include <FileManagement/flm_dtc.h>
+#include <FileManagement/flm_ftc.h>
+
+namespace FileManagement
+{
+/**
+ * @brief The DataInterface class provides the Topics Clients only for the GUI Plugins
+ */
+class DataInterface : public DataPluginBase::Interface
+{
+public:
+  using DataPluginBase::Interface::Interface;
+
+  virtual std::shared_ptr<FileManagement::Interface::Dtc> getDtc() = 0;
+  virtual std::shared_ptr<FileManagement::Interface::Ftc> getFtc() = 0;
+};
+
+} // namespace FileManagement