OpenUSD v25.11 Gf Matrix Decomposition Adaptation Notice

Portions of ovclash's ovstage backend in
source/GfMatrixDecomposition.h are adapted from OpenUSD v25.11 Gf
matrix, transform, rotation, quaternion, vector, and math arithmetic.

OpenUSD is Copyright 2016 Pixar.
Modifications are Copyright 2026 NVIDIA CORPORATION & AFFILIATES.

This is a source-code adaptation. The ovstage backend does not directly link
OpenUSD. The adapted portions are provided under the Tomorrow Open Source
Technology License 1.0 and other notices reproduced in the accompanying
LICENSE.txt.

Original sources:
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/matrix4d.cpp
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/transform.cpp
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/rotation.cpp
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/quatd.cpp
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/rotation.h
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/vec3d.h
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/quatd.h
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/math.h
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/gf/limits.h
https://github.com/PixarAnimationStudios/OpenUSD/blob/v25.11/pxr/base/arch/math.h
