Robust, integer crosses for is_straight_line_drawing #461

Job	Run time
macos (clang, 20)	6m 7s
macos (clang, 17)	8m 46s
macos (clang, 14)	7m 18s
windows_msvc_14_3 (msvc-14.3)	23m 14s
posix-cmake-subdir (ubuntu-24.04)	1m 23s
posix-cmake-subdir (ubuntu-22.04)	1m 20s
posix-cmake-subdir (macos-15)	1m 50s
posix-cmake-subdir (macos-14)	1m 15s
windows-cmake-install (windows-2022)	3m 40s
ubuntu (gcc-14, 23)	8m 59s
ubuntu (gcc-14, 14)	7m 12s
windows-cmake-subdir (windows-2022)	2m 57s
ubuntu (clang-19, 20)	9m 20s
ubuntu (gcc-14, 17)	7m 12s
windows-cmake-install (windows-2025)	4m 6s
ubuntu (clang-19, 17)	8m 0s
windows-cmake-subdir (windows-2025)	3m 24s
ubuntu (gcc-14, 20)	8m 13s
ubuntu (clang-19, 14)	7m 41s
ubuntu (clang-19, 23)	10m 15s
posix-cmake-install (macos-14)	2m 16s
posix-cmake-install (macos-15)	1m 48s
posix-cmake-install (ubuntu-24.04)	1m 40s
posix-cmake-install (ubuntu-22.04)	1m 29s
	2h 19m 25s

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