- General/common
-- HALF-DONE: Locking?
-- DONE: Constants for common file dests
-- DONE: Func to write to dest, backing up dest if exists first
-- DONE: Test ssh config (sshd -t) and rollback if fail
-- When completely done, go.mod

- Key generation
-- DONE: Generate priv/pubkeys
-- DONE: Build key structure
-- write out base64 with headers to files

- SSH Moduli
-- NOT NEEDED?: Do DH param gen in goroutine so we can do other things while it spawns and runs
--- Check if haveged is running. If not and installed, start it.
--- Generate moduli
-- DONE: Render to /etc/ssh/moduli format
--- DONE: custom moduli marshaler/unmarshaler? (e.g. https://stackoverflow.com/a/50211222)
-- Write to dest

- Config
-- Need to merge in changes
-- Track options in struct?
--- add subtype structs