In help display sort commands alphabetically

[tedivm]

resolves #625

[tedivm]

Unlike #622, this uses localeCompare for sort. That should make it more robust against special characters, and also makes it ignore case for sorting.

[mojavelinux]

👍

[shadowspawn]

I am concerned this change will undo custom ordering that people have done over the years and so we might need to allow an opt-out (although in general I don't want options for every behaviour). Closing this and making some notes in the linked issue for discussion.