Escape strings containing font glyphs (Nerd Font compatibility) #220

Job	Run time
ycat	15s
Test with -race (ubuntu-latest, 1.19)	23s
Test in i386 (ubuntu-latest, 1.19)	21s
Coverage	25s
Test with -race (ubuntu-latest, 1.20)	17s
Test in i386 (ubuntu-latest, 1.20)	21s
Test in i386 (ubuntu-latest, 1.21)	20s
Test with -race (ubuntu-latest, 1.21)	21s
Test in i386 (windows-latest, 1.19)	49s
Test with -race (macos-latest, 1.19)	26s
Test in i386 (windows-latest, 1.20)	1m 12s
Test with -race (macos-latest, 1.20)	1m 7s
Test in i386 (windows-latest, 1.21)	1m 19s
Test with -race (macos-latest, 1.21)	40s
Test with -race (windows-latest, 1.19)	1m 5s
Test with -race (windows-latest, 1.20)	1m 17s
Test with -race (windows-latest, 1.21)	1m 20s
	11m 58s

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