Load a customized config into a droplet

[proegssilb]

Possibly blocked by #4 , definitely blocked by #8

We should be using owner/member information to populate server whitelists, so that games don't need to have passwords, and still have good security.

The config files loaded into the server also includes a token so the servers can authenticate with the server browser, which FSM also needs to store (and not display).

This will require extending the user profile to include information on Factorio identities. And also Factorio tokens?