Improve error reporting for TGAs with invalid palettes (#570) #299

Job	Run time
build (windows-2019, x64-Debug, amd64)	1m 20s
build (windows-2019, x64-Release, amd64)	1m 55s
build (windows-2022, x64-Debug, amd64)	1m 28s
build (windows-2022, x64-Release, amd64)	1m 40s
build (windows-2019, x86-Debug, amd64_x86)	2m 42s
build (windows-2019, x86-Release, amd64_x86)	2m 11s
build (windows-2022, x86-Debug, amd64_x86)	1m 51s
build (windows-2022, x86-Release, amd64_x86)	2m 12s
build (windows-2022, arm64-Debug, amd64_arm64)	1m 46s
build (windows-2022, arm64-Release, amd64_arm64)	1m 49s
build (windows-2022, arm64ec-Debug, amd64_arm64)	2m 13s
build (windows-2022, arm64ec-Release, amd64_arm64)	1m 54s
build (windows-2022, x64-Debug-Win8, amd64)	1m 43s
build (windows-2022, x64-Release-Win8, amd64)	3m 21s
build (windows-2022, x64-Debug-Clang, amd64)	2m 33s
build (windows-2022, x64-Release-Clang, amd64)	2m 46s
build (windows-2022, x86-Debug-Clang, amd64_x86)	2m 24s
build (windows-2022, x86-Release-Clang, amd64_x86)	2m 33s
build (windows-2022, arm64-Debug-Clang, amd64_arm64)	2m 23s
build (windows-2022, arm64-Release-Clang, amd64_arm64)	1m 47s
	42m 31s

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