#680: Remove/simplify constants #300

Job	Run time
baseline (fedora-clang-17, Release)	11m 50s
baseline (fedora-clang-17, Debug)	8m 56s
baseline (fedora-gnu-13, Release)	10m 50s
baseline (fedora-gnu-13, Debug)	9m 3s
baseline (ubuntu-clang-14, Release)	12m 49s
baseline (ubuntu-clang-14, Debug)	9m 4s
baseline (ubuntu-gnu-11, Release)	10m 26s
baseline (ubuntu-gnu-11, Debug)	9m 2s
baseline (ubuntu-gnu-11, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	11m 56s
baseline (ubuntu-clang-14, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	12m 52s
baseline (fedora-gnu-13, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	12m 48s
baseline (fedora-clang-17, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	14m 16s
	2h 13m 52s

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