Fix gui_plugin_interface.h m_logger member and ltsmultimonitor_export.h alias

- Add m_logger member to GuiPluginInterface private section
- Create ltsmultimonitor_export.h as alias for lts_multi_monitor_export.h

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

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

@@ -1,5 +1,8 @@
 
 
+#ifndef LTS_COMMON_PROJECTCONFIG_PROJECT_DEFINES_H
+#define LTS_COMMON_PROJECTCONFIG_PROJECT_DEFINES_H
+
 #pragma once
 
 #include <ostream>
@@ -64,3 +67,5 @@ inline std::string replayPartition(int partitionId)
 }
 
 } // namespace IDL
+
+#endif // LTS_COMMON_PROJECTCONFIG_PROJECT_DEFINES_H