Improve error reporting for TGAs with invalid palettes #297

Job	Run time
build (windows-2019, x64-Debug, amd64)	2m 25s
build (windows-2019, x64-Release, amd64)	2m 47s
build (windows-2022, x64-Debug, amd64)	2m 8s
build (windows-2022, x64-Release, amd64)	2m 12s
build (windows-2019, x86-Debug, amd64_x86)	3m 16s
build (windows-2019, x86-Release, amd64_x86)	3m 56s
build (windows-2022, x86-Debug, amd64_x86)	1m 31s
build (windows-2022, x86-Release, amd64_x86)	1m 57s
build (windows-2022, arm64-Debug, amd64_arm64)	1m 38s
build (windows-2022, arm64-Release, amd64_arm64)	2m 13s
build (windows-2022, arm64ec-Debug, amd64_arm64)	2m 21s
build (windows-2022, arm64ec-Release, amd64_arm64)	2m 20s
build (windows-2022, x64-Debug-Win8, amd64)	1m 58s
build (windows-2022, x64-Release-Win8, amd64)	2m 25s
build (windows-2022, x64-Debug-Clang, amd64)	2m 15s
build (windows-2022, x64-Release-Clang, amd64)	2m 31s
build (windows-2022, x86-Debug-Clang, amd64_x86)	2m 3s
build (windows-2022, x86-Release-Clang, amd64_x86)	2m 8s
build (windows-2022, arm64-Debug-Clang, amd64_arm64)	2m 5s
build (windows-2022, arm64-Release-Clang, amd64_arm64)	3m 13s
	47m 22s

Provide feedback