Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Plugins/BuildingViewer/share/_README.txt

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+The following files are identical to the ones used within the BuildingViewer SVN project (See folder BuildingViewer/source/viewerCtrl/).
+Since the BuildingViewer is compiled and started as an external application but data is exchanged between plugin and BuildingViewer the files for
+data handling are for now contained within this folder.

qt6-after/qt6-migrated-legatus/Lts/Plugins/BuildingViewer/share/exccommands.h

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+#pragma once
+
+
+
+namespace BuildingViewer
+{
+enum AssetTypes {IndoorCamera = 200, IndoorCameraWithSpeaker, AnnouncementUnit, EffectGenerationUnit};
+enum BgViewerEvents {WidgetClosed, WidgetMaximized, WidgetMinimized, WidgetGotFocus, RoomNameClicked};
+}