Initial commit: QInventor CAD workbench for Windows

THIRD_PARTY_NOTICES.md

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+# Third-party components
+
+QInventor uses the unmodified official FreeCAD 1.1.4 Windows x86-64 Python 3.11
+portable distribution, including Open CASCADE, Qt, Coin3D, Python, Sketcher,
+PartDesign, Assembly, TechDraw, Draft, CAM, FEM and their dependencies.
+
+FreeCAD source and corresponding release: https://github.com/FreeCAD/FreeCAD/tree/1.1.4
+FreeCAD license: https://github.com/FreeCAD/FreeCAD/blob/1.1.4/LICENSE
+The upstream distribution's license, COPYING and dependency notices remain in
+`runtime`. This project's MIT license applies only to QInventor's own source.
+Users can replace the runtime with a compatible official distribution; QInventor
+does not modify or statically link FreeCAD. Runtime source is available at the
+release link above.
+
+Autodesk and Autodesk Inventor are trademarks of Autodesk, Inc. QInventor is
+an independent application and has no affiliation with Autodesk. Native Inventor
+IPT/IAM/IDW interoperability and identical internal proprietary algorithms are
+not implemented. Use neutral STEP/IGES formats to exchange models.