Create a config update command

[SpicyLemon]

Summary

Create a config update command that reads the current config files then writes them using the current file templates.

Problem Definition

The config files have been getting some new fields lately (and some fields removed). As a node operator, I want to easily update the config files to include all the new stuff and get rid of the unneeded stuff, so that I can more easily configure my node with respects to new stuff.

Proposal

Add an update sub-command to the config command. This would read the current configs then write them using the current file templates. Any fields not in the original config file would get values defined by their respected DefaultConfig functions.

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