add gamma_ramp_arrays and calculate_gamma_ramp #557

Job	Run time
build linux pkg-config	1m 44s
build bundled (macos-latest)	2m 22s
build vcpkg (macos-latest)	3m 23s
build bundled (ubuntu-latest)	2m 3s
build vcpkg (ubuntu-latest)	7m 13s
build bundled (windows-latest)	4m 31s
build vcpkg (windows-latest)	8m 40s
build bundled (--release, macos-latest)	2m 2s
build bundled (--release, ubuntu-latest)	2m 41s
build bundled (--release, windows-latest)	6m 12s
build bundled (static-link, macos-latest)	2m 42s
build bundled (static-link, ubuntu-latest)	2m 31s
build bundled (static-link, windows-latest)	5m 23s
build bundled (static-link, --release, macos-latest)	2m 6s
build bundled (static-link, --release, ubuntu-latest)	2m 9s
build bundled (static-link, --release, windows-latest)	6m 2s
	1h 1m 44s

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