add gamma_ramp_arrays and calculate_gamma_ramp #558

Job	Run time
build vcpkg (macos-latest)	3m 38s
build linux pkg-config	3m 2s
build bundled (macos-latest)	2m 18s
build vcpkg (ubuntu-latest)	6m 45s
build bundled (ubuntu-latest)	2m 25s
build vcpkg (windows-latest)	7m 53s
build bundled (windows-latest)	4m 43s
build bundled (--release, macos-latest)	1m 58s
build bundled (--release, ubuntu-latest)	2m 24s
build bundled (--release, windows-latest)	6m 10s
build bundled (static-link, macos-latest)	2m 24s
build bundled (static-link, ubuntu-latest)	2m 29s
build bundled (static-link, windows-latest)	5m 15s
build bundled (static-link, --release, macos-latest)	2m 20s
build bundled (static-link, --release, ubuntu-latest)	2m 39s
build bundled (static-link, --release, windows-latest)	5m 56s
	1h 2m 19s

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