Unify per-server configuration

[guineawheek]

For various historical reasons, largely database related, Dozer's server configuration options are scattered across nearly a dozen different commands with varying syntax, presentation, and even ability to be unset.

The FTC fork addressed this by unifying all the config commands as subcommands of %serverconfig, and providing a %serverconfig unset [subcommand] to unset settings:

On the backend, the configuration tables were unified into one large table. I don't know how much utility this poses, but it keeps everything in one spot

It would be nice to have a better UI to present server configuration along with possibly unifying the per-server config (to the extent reasonable)