Deduplicate string literals and allow null bytes #238

Job	Run time
bootstrap-bash-2_05a	48s
bootstrap-pnut-sh-with-pnut-exe (i386_linux)	20s
bootstrap-pnut-exe (bash, i386_linux)	3m 2s
bootstrap-pnut-sh-with-pnut-exe (x86_64_linux)	12s
bootstrap-pnut-sh (bash)	1m 14s
bootstrap-pnut-exe (bash, x86_64_linux)	3m 2s
bootstrap-pnut-sh-with-pnut-exe (x86_64_mac)	15s
build-without-warnings	15s
bootstrap-pnut-sh (dash)	1m 37s
bootstrap-pnut-exe (bash, x86_64_mac)	2m 33s
bootstrap-pnut-sh (ksh)	37s
bootstrap-pnut-exe (dash, i386_linux)	4m 23s
bootstrap-pnut-sh (mksh)	4m 20s
catch-bad-whitespace	5s
bootstrap-pnut-exe (dash, x86_64_linux)	4m 22s
tests-exe (i386_linux, ubuntu-latest)	16s
bootstrap-pnut-sh (yash)	1m 18s
bootstrap-pnut-exe (dash, x86_64_mac)	4m 24s
tests-exe (x86_64_linux, ubuntu-latest)	13s
bootstrap-pnut-sh (zsh)	4m 20s
bootstrap-pnut-exe (ksh, i386_linux)	1m 17s
tests-exe (x86_64_mac, macos-latest)	12s
tests-shell (bash)	14s
bootstrap-pnut-exe (ksh, x86_64_linux)	1m 18s
tests-shell (dash)	14s
bootstrap-pnut-exe (ksh, x86_64_mac)	54s
tests-shell (ksh)	27s
tests-shell (mksh)	14s
tests-shell (yash)	1s
tests-shell (zsh)	1s
success-message	1s
	42m 29s

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