Setting `/eln debug true` on a client connected to a multiplayer server only sets debug mode on client

[jrddunbr]

Probably should have an /eln debug client true command or something when the user isn't in multiplayer?

[jrddunbr]

/eln debug server true
/eln debug client true
/eln debug both true - only in singleplayer; in a multiplayer setting returns error
/eln debug true - same behavior as /eln debug both true.

This allows for debugging rendering or background tasks, or both during dev/singleplayer testing.

In multiplayer, the sync issues with new clients connecting and pushing out from one client to server to other clients is not worth the frustration and can cause connected clients to unnecessarily build logs for what may be a server-side issue in the first place. (server side logging is most common by far)

[TheBuilderBoy76]

Partially addressed in #484. Everything I needed has been taken care of, but it might still be worth looking into adding separate client-side and server-side debug commands.

[TheBuilderBoy76]

Also, as mentioned in Discord, the /eln debug command currently only updates the SERVER-side config, NOT the client-side.