Add DDS_LOADER_IGNORE_MIPS flag to DDSTextureLoader #91

Job	Run time
build (windows-2019, x64-Debug, amd64)	2m 28s
build (windows-2019, x64-Release, amd64)	2m 31s
build (windows-2022, x64-Debug, amd64)	1m 57s
build (windows-2022, x64-Release, amd64)	2m 42s
build (windows-2019, x86-Debug, amd64_x86)	2m 1s
build (windows-2019, x86-Release, amd64_x86)	3m 5s
build (windows-2022, x86-Debug, amd64_x86)	1m 53s
build (windows-2022, x86-Release, amd64_x86)	3m 1s
build (windows-2022, x64-Debug-Clang, amd64)	2m 36s
build (windows-2022, x64-Release-Clang, amd64)	3m 18s
build (windows-2022, x86-Debug-Clang, amd64_x86)	1m 46s
build (windows-2022, x86-Release-Clang, amd64_x86)	3m 35s
build (windows-2022, arm64-Debug, amd64_arm64)	2m 48s
build (windows-2022, arm64-Release, amd64_arm64)	3m 35s
build (windows-2022, arm64ec-Debug, amd64_arm64)	2m 50s
build (windows-2022, arm64ec-Release, amd64_arm64)	3m 22s
	43m 28s

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