Build on Linux/macOS

Respect plot char for case `ttyplot -c X -2` (fixes #113) #13

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Run time

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Job	Run time
Build (gcc-13 on ubuntu-22.04)	13s
Build (clang-17 on ubuntu-22.04)	18s
Build (clang-18 on ubuntu-22.04)	20s
Build (gcc-13 on macos-12)	13s
Build (clang-15 on macos-12)	11s
	1m 15s