Code review for ModelMeshPart collection (#302) #150

Job	Run time
build (windows-2019, x64-Debug, amd64)	1m 46s
build (windows-2019, x64-Release, amd64)	2m 53s
build (windows-2022, x64-Debug, amd64)	2m 12s
build (windows-2022, x64-Release, amd64)	3m 14s
build (windows-2019, x86-Debug, amd64_x86)	2m 9s
build (windows-2019, x86-Release, amd64_x86)	3m 38s
build (windows-2022, x86-Debug, amd64_x86)	2m 26s
build (windows-2022, x86-Release, amd64_x86)	3m 7s
build (windows-2022, x64-Debug-Clang, amd64)	2m 20s
build (windows-2022, x64-Release-Clang, amd64)	3m 46s
build (windows-2022, x86-Debug-Clang, amd64_x86)	2m 18s
build (windows-2022, x86-Release-Clang, amd64_x86)	2m 45s
build (windows-2022, arm64-Debug, amd64_arm64)	2m 13s
build (windows-2022, arm64-Release, amd64_arm64)	3m 9s
build (windows-2022, arm64ec-Debug, amd64_arm64)	3m 18s
build (windows-2022, arm64ec-Release, amd64_arm64)	3m 40s
	44m 54s

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