switch to AgX tonemapping #882

Job	Run time
macos-13 / Release / homebrew-clang	18m 37s
ubuntu-22.04 / Release / gcc-11	25m 54s
macos-13 / Debug / homebrew-clang	16m 8s
ubuntu-22.04 / Debug / gcc-11	21m 24s
ubuntu-22.04 / Release / gcc-12	28m 8s
windows-2019 / Release / cl	35m 49s
ubuntu-22.04 / Debug / gcc-12	24m 24s
windows-2019 / Release / clang	37m 14s
ubuntu-22.04 / Release / gcc-13	25m 36s
windows-2019 / Release / clang-cl	36m 41s
ubuntu-22.04 / Debug / gcc-13	22m 3s
windows-2019 / Debug / cl	23m 49s
ubuntu-22.04 / Release / clang-14	25m 15s
windows-2019 / Debug / clang	33m 22s
ubuntu-22.04 / Debug / clang-14	19m 0s
windows-2019 / Debug / clang-cl	34m 4s
ubuntu-22.04 / Release / clang-15	24m 19s
windows-2022 / Release / cl	33m 22s
ubuntu-22.04 / Debug / clang-15	19m 58s
windows-2022 / Release / clang	39m 52s
ubuntu-22.04 / Release / clang-16	24m 31s
windows-2022 / Release / clang-cl	33m 29s
ubuntu-22.04 / Debug / clang-16	20m 7s
windows-2022 / Debug / cl	33m 38s
ubuntu-22.04 / Release / clang-17	25m 29s
windows-2022 / Debug / clang	34m 50s
ubuntu-22.04 / Debug / clang-17	20m 59s
windows-2022 / Debug / clang-cl	33m 32s
	12h 51m 34s

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