Add a mensural option help category. Closes #3240 #1416

Job	Run time
Copy the font files	5s
Build ubuntu-20.04-g++-9	6m 13s
Build ubuntu-20.04-g++-10	7m 29s
Build ubuntu-20.04-g++-11	9m 28s
Set up and cache emscripten	10s
Build ubuntu-20.04-clang-6.0	6m 1s
Build ubuntu-20.04-clang-9	6m 21s
Build ubuntu-20.04-clang-12	5m 54s
Build macos-latest-xcode-13.1	5m 25s
Build macos-latest-xcode-14.2	3m 33s
Build macos-11-g++-12	7m 32s
Build JS toolkit (nohumdrum, Building toolkit without humdrum, -c -H -M, verovio-toolkit.js*)	9m 1s
Build JS toolkit (light, Building toolkit without humdrum as light version, -c -H -l -M, verovio-...	10m 56s
Build JS toolkit (wasm, Building toolkit without humdrum as wasm, -c -H -w -M, veroviowasm, true)	7m 16s
Build JS toolkit (default, Building default toolkit with humdrum, -c -M, -hum.js)	12m 16s
Check settings for deployment	2s
Build documentation	2m 57s
Deploy JS toolkit	2m 0s
Deploy documentation	5m 19s
Skip deployment if set	0s
	1h 47m 58s

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