Document interaction with other Velocity plugins

Velocity plugin developers like myself may not use Limbo, but many of our users do. Also, developing software for a cracked network requires extreme vigilance so that unauthenticated players are not assumed as trusted.

So I would like clarification: how does LimboAuth interact with other plugins? This question is very important and should definitely be stated or clarified somewhere. LimboAuth hooks into Velocity internals so the answer is not obvious.

For example:
- Is there a `RegisteredServer` which the player is considered connected to, while they are in limbo? What is the server name? Are server switch events fired?
- Do limbo players appear in Velocity APIs like `server.getAllPlayers()`?
- Can limbo players execute plugin commands, or does LimboAPI block commands during limbo?

I imagine many developers, including myself, would benefit from this information being clearly stated.