Make Toolshed commands names default to snake_case

[ElectroJr]

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Currently toolshed will autogenerate command names from class names by just lowering all the characters. I.e., CountLeadZerosCommand becomes "countleadzeros". This PR changes that to use snake case (i.e., "count_lead_zeros", as I personally think this makes commands more readable. See also the discussion around these proposed conventions https://github.com/space-wizards/docs/pull/210.

Requires https://github.com/space-wizards/space-station-14/pull/36524