* add lnms commands to get and set config settings
lnms config:get and lnms config:set
Note: you cannot override settings in config.php
* Update to check setting exists and value validation rules.
* Add lnms user:add command
Uses events to mark past notifications as read (even for non-manually added users)
* Filter out previous options from auto-completion
* use validation to check cli input
* Warn if using other auth
* abstract LnmsCommand
* Use setPassword helper for hashing instead of mutator
* Extract validation function